DEFINITION microfarad Posted by: Margaret Rouse WhatIs.com Contributor(s): Kenda, Jack Clements The microfarad (symbolized µF) is a unit of capacitance, equivalent to 0.000001 (10 to the -6th power) farad. The microfarad is a moderate unit of capacitance. In utility alternating-current (AC) and audio-frequency (AF) circuits, capacitors with values on the order of 1 µF or more are common. At radio frequencies (RF), a smaller unit, the picofarad (pF), is often used. This unit is equal to .000000000001 (10^-12) µF. In RF scenarios, capacitances range from about 1 pF to 1,000 pF in tuned circuits, and from about 0.001 µF to 0.1 µF for blocking and bypassing. At audio frequencies (AF), capacitances range from about 0.1 µF to 100 µF. In power-supply filters, capacitances can be as high as 10,000 µF. Capacitor, 1/3 M.F.D. (microfarad) within wooden insulating box. Two terminal posts set in an insulating box. Maker's name and place 1/3 M.F.D No. 34402scientific instrument, capacitor, electrical engineering, laboratory

What device converts AC to DC? rectifier A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction. The process is known as rectification, since it "straightens" the direction of current. The unit was used at Ballarat School of Mines in the Maths, Science and Physics Departments.Grey metal unit with Dials on the front and vents at the back. Handle for carrying. Two switches for turning on and off. Yellow sticker - SMB - with number 116071. Engraved on back - S.M.B.. Maths / Science / Physics Sticker on cord indicating inspection of unit - 13/04/2005. Tag Number - 032735alternating current, direct current, ac, dc, rectifier, electrical, ballarat school of mines, science, maths, physics

The unit was used at Ballarat School of Mines in the Maths, Science and Physics Departments.Grey metal unit with Dials on the front and vents at the back. Handles for carrying. Two circuit breaker switches, two DC output sockets, two AC output socketsYellow sticker - SMB - with number 116069. Engraved on back - S.M.B.. Maths / Science / Physics Sticker on cord indicating inspection of unit - 13/04/2005. Tag Number - 032725alternating current, direct current, ac, dc, electrical, ballarat school of mines, science, maths, physics, ac/dc, scientific instrument

Used for teaching chemistry principles of measuring electrical power.A teaching / demonstration model with large scale and transparent panels. Polished wooden frame. Direct current - moving coil Volt-AmmeterBlack tape on front panel "PHYSICS"chemistry, electrical power, physics, voltmeter, ammeter, direct current, scientific instrument

George Reed was a draftsman living in the City of Moorabbin c 1950 1899, David Misell, invented this "electric device" ( torch / flashlight) powered by "D" batteries laid front-to-back in a paper tube with the light bulb and a rough brass reflector at the end. Misell assigned his invention over to the American Electrical Novelty and Manufacturing Company owned by Conrad Hubert. In 1905, Hubert changed the name again to The American Ever Ready Company, selling torches / flashlights and batteries under the trademark Ever Ready. In 1906 the British Ever Ready Electrical Company was formed for export of batteries; it became independent in 1914. The American Ever Ready Company became part of National Carbon Company in 1914. The trademark was shortened to Eveready. In 1986, Union Carbide sold its Battery Products Division to Ralston Purina Company becoming the Eveready Battery Company, Inc. and in 1992, it bought the British Ever Ready Electrical Company. Prior to March 1, 1980, the company's alkaline battery had been called the Eveready Alkaline Battery (1959–1968), Eveready Alkaline Energizer (1968–1974) and Eveready Alkaline Power Cell (1974–February 29, 1980). On March 1, 1980, it was rebadged under its current name, Energizer. 2019 production plant in Portage, Wisconsin, but the majority of batteries are made in China and there are also numerous production facilities outside the US. This is an industrial strength Eveready Torch made in England and was used by George Reed, a draftsman, who lived in Bentleigh , City of Moorabbin in mid 20th CLarge 'Eveready' industrial hand torch/ flashlight with rubber protective coverEVEREADY /MADE IN ENGLAND clothing, manufactured lace, dressmaking, blouses, theatrical props, lights, torches, lighting, early settlers, moorabbin shire, mechanics institute cheltenham, postworld war 11 settlers, housing estates moorabbin 1950, bentleigh, ormond, moorabbin, cheltenham, , clark judy, reed gladys, reed george

As supply of electricity became available in the Moorabbin Shire c 1920 homes gradually changed from Gas lighting to Electrical lighting and bakelite was used for fittings. Bakelite was a safe non-conductor of the electric current. Housewives, who had ironed clothes with flat irons heated on the hearth of open fires, were delighted to be able to stand on a chair and remove the light globe and plug in their new clean and efficient electric iron. The supply of electricity to homes in the City of Moorabbin in the early 20th Century brought many welcome changes to domestic and commercial life 3 Electrical, fittings c 1931 a) a bakelite plug and socket Made in Australia b) a bakelite bayonet fitting Made in England ;c) Bakelite screw type with no markings d) A large brass and porcelain screw type with no markings L8 a) Australian Made / PIMI b) British Made in England c) No marks d) no marks electricity, electric lights, electric irons, bakelite, market gardeners, early settlers, moorabbin shire, mechanics institute cheltenham, postworld war 11 settlers, housing estates moorabbin 1950, bentleigh, ormond, moorabbin, cheltenham, clark judy, reed gladys, reed george

Steel, aluminium, plastic and copper. Transformer used to reduce current from 240 to 110 volt for use with tenetyps machine. Iten painted in non reflective grey. 6 electrical plugs on front.Label on back of item - Gordon & Joy Garbott. 64-66 Poldfett Street, Darystock. Vic 3992signals, transformer

Yields information about the rates for electricity in Geelong and Ballarat., Yields information about the rates for electricity in Geelong and Ballarat..1 - Memorandum to Manager Ballarat from Engineer Melbourne, dated 28/3/1962, forwarding a copy of a series of questions put to the local Manager from the Ballarat Courier and a response from Minister for Electrical Undertakings Murray Byrne. .2 - Report - address to the Minister - 4 foolscap sheets, questions involved the rate for electricity in Geelong prior to the closure of the Geelong system and the current rates, power consumption in Geelong and Ballarat and how much power did the trams used the previous year. All sheets have round edges.trams, tramways, geelong, electricity supply, power supply

Carbon typed copy of a technical procedure - 3 pages "Rectifier Protection" gives details on cell failures, surge voltage protection, bridge circuits, over current and provides four figures to illustrate the paper. Written D.B. Corbyn and N. L. Potter in a paper to the Institute of Electrical Engineers London. Not dated. Assumed mid 1930's. BTPS Number "216". "216" in ink on left hand bottom of first pagetrams, tramways, electrical engineering

Book - 24 pages + grey covers, side stapled, issued by the Australian Commonwealth Engineering Standards Association, Tentative Australian Standard C.2 - 1925, "Electrical Performance of Traction Motors - Direct Current Series Wound". Dated Dec. 1925. Provides an index and information about enclosures, ratings, testing and information to be supplied.On top right hand corner has stamp of the "The Electric Supply Co. of Victoria Ltd Ballarat" and date "17 April 1934".trams, tramways, tramways, electrical equipment, motors

Correspondence re Closure of Capital Theatre 1977; following Health Department ordering repairs to building and electrical repairs. Two cuttings from Bendigo Advertiser (2/7/77 & 4/7/77); ''Comment by His Worship The Mayor - Cr. R R Cooper'' (p.8 of what appear to be Council Minutes 947/77) re Motion regarding alternative course of action in relation to Kangaroo Flat Technical School facility; handwritten comments on R Cooper's paper (on back of BCAE envelope); letter from Bendigo Operatic Society to Bendigo City Council re affects of closure; letter from Board of Management, Masonic Hall, re draft letter to Dept of Health in reply to matters to be complied with under current regulations; copy of Draft Letter.

The foundation stone for St George's Church of England, Mont Albert was laid in 1886 on land donated by Edward Dyer and the first service was preached in January 1887. From 1904 until 1907 it was known as Holy Trinity, Surrey Hills. The original church was weatherboard and replaced by a brick one in the Gothic Revival style which was designed by local architect George J V Blackburne, who also designed the Wesleyan School at Surrey Hills. The building was partly funded by donations, profits from a bazaar and concert, and other people donated furnishings. The church had boundaries along Mont Albert Road and St Georges Road. In 1998 the Church was sold and converted into a complex of units. Its current address is 19 St Georges Avenue, Mont Albert. The purpose of this working bee in 1923 was to close up the double gateway, which in earlier times had been used for entry of by horse-drawn vehicles to the church grounds. 'Lugano' was built in 1893 for William Wilson, a prominent stonemason and importer of marble fireplaces. In 1903 it became the home of William Holmes who was Chief Electrical Engineer for the Victorian Railways. He designed the electrification of the Melbourne suburban network. 'Lugano' stayed in the Holmes family until the 1930s. Norman Carter took many photos of Surrey Hills and Mont Albert from the 1920s in particular of events and activities associated with the Church of England.Black and white photo of 6 men behind and in front of a picket fence, a section of which has posts and railings only. In front of the fence is a wide grassy verge on which a bench is set up for cutting lengths of wood. A large Victorian house ('Lugano') can be seen in the background and a lamp post with a street sign. Beyond the house are mature eucalyptus trees.churches, holy trinity church, anglican church, st george's anglican church, working bees, lugano, william holmes, william wilson, norman brodley carter

The drags would have been leaving St George's Church of England in Mont Albert Road. The foundation stone for St George's Church of England, Mont Albert was laid in 1886 on land donated by Edward Dyer and the first service was preached in January 1887. From 1904 until 1907 it was known as Holy Trinity, Surrey Hills. The original church was weatherboard and replaced by a brick one in the Gothic Revival style which was designed by local architect George J V Blackburne, who also designed the Wesleyan School at Surrey Hills. The building was partly funded by donations, profits from a bazaar and concert, and other people donated furnishings. The church had boundaries along Mont Albert Road and St Georges Road. In 1998 the Church was sold and converted into a complex of units. Its current address is 19 St Georges Avenue, Mont Albert. The annual Sunday School picnic was held at Hampton and drags were the usual mode of transport. 'Lugano' was built in 1893 for William Wilson, a prominent stonemason and importer of marble fireplaces. In 1903 it became the home of William Holmes who was Chief Electrical Engineer for the Victorian Railways. He designed the electrification of the Melbourne suburban network. 'Lugano' stayed in the Holmes family until the 1930s. The annual Sunday School picnic was held at at a variety of locations and drags were the usual mode of transport. Donor information is that this was taken as the congregation prepared to depart for at Hampton on the picnic held on 25/2/1922. There are 2 copies: the original donated print and an enlargement. The original was mounted on card with photo mounts along with 506, 871, 872, and 873. It measures 13 cm x 9 cm.Black and white photo of 4 'drags' (horse-drawn hooded carriages) lined up in Mont Albert Road near the corner of St George's Avenue, in readiness for departure for the Sunday School picnic. The carriages are loaded with people and decorated with flags. The front carriage has a material sign attached to the side; the top line of writing is not decipherable, but the bottom one reads "SURREY HILLS". Four men stand in the road, which has bluestone curb and channelling. In the background is 'Lugano'.On rear in ink: "S.S. picnic to Hampton / 25th. Feb. 1922" and in a different hand in biro: "At Mont Albert. St George's Church"churches, holy trinity church, anglican church, sunday schools, picnics, lugano, horse-drawn vehicles, william wilson, willaim holmes, st george's church of england, mont albert, mont albert road

A telegraph or Morse key, sends a series of electrical signals down a telegraph line or via radio frequencies; the signals are interpreted as Morse code, a binary form of language constructed of 'dots and dashes', combinations of which correspond to letters of the alphabet. The motion of the key acts to complete an electrical circuit between the sender and receiver, producing a short pulse 'dot' or longer 'dash,' the space between the code indicates a broken current or wave.Device used to transmit telegraphic messages in Morse code through the manipulation of electric signals. The metal 'key' sits in a central bracket on which it moves up and down aided by a spring, controlled by an operator pushing the black Bakelite knob on the protruding end of the device. The motion presses the key onto a circular metal disc, completing the circuit and sending an electrical pulse to the receiver. The apparatus is secured to a wooden base with wires attached to the terminals; a cut out section of the base suggests wires may have entered through this area, attaching to a battery.Printed ink on base: "PMG"telegraph, telegraphist, morse code, mechanisation

Horace Darwin, youngest surviving son of Charles Darwin, was a founding partner of the Cambridge Scientific Instrument Company in 1881 (http://www.museumoftechnology.com/cic.html).Composite object with three feet supporting two squared cylinders attached to a clamping device and metal block with four current terminals. Cylinders are covered with red leather. Metal block and clamp base appear painted.Engraved on terminal block: 'No 15548 / THE CAMBRIDGE SCIENTIFIC INSTRUMENT CO LTD. CAMBRIDGE. ENGLAND' Engraved on side of terminal block: 'To be excited from 200 volts circuit / with coils in series. Connect terminals 2 & 3.'cambridge scientific instrument company, electro magnet, electrical equipment, electrical instrumentation

Booklet - 20 pages, printed on off white paper, centre stapled within a grey cover slightly larger than the printed document, titled "The Case for Electric Road Passenger Transport". The title is printed on both document covers. The title is contained within a embossed area on the grey cover. The document looks at the case for electric transport in road use, both trolley buses and trams, current developments, including PCC cars, traffic problems, Europe, financial, passengers, reserved track, health and cleanliness. Not date, early 1950's? - has a reference to a 1951 public transport conference on page 5. On the rear page states "Issued by the British Electrical Development Association" of London."4K1" in ink on front cover and AETA stamp top of cover. AETA stamp and PR Officer 14 Kenaway St, Tusmore F3111" (Tusmore is in Adelaide).trams, tramways, public transport, uk, electrical equipment, electric vehicles, trolley buses, trams, pcc

Explains with diagrams how tram substations work. Published Transport for Victoria and Yarra Trams for Community Information purposes. Notes that currently (2019) trams substation were in use and that at least another 30 planned.Yields information on tramway substations for community information purposes.Pamphlet - printed on 200gms A4 card titled "Introduction to tram substations". Published by Public Transport Victoria and Yarra Trams 2019.yarra trams, substations, tramways, electrical engineering, consultation

Newspaper cutting about the possibility of electric shocks from tramcars due to the application of too much sand on the tracks, and not allowing the return current. Tram becomes insulated.Yields information about the possibility of electric shocks from tramcars if excessive sand applied to tracks.Newspaper cutting from the Newcastle Herald, NSW newspaper titled "Trams may give electric shocks""NH 13.6.00"trams, tramways, melbourne, electrical engineering, tramcars, electricity, safety