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• Timer
  ...t board]] with control chip and [[LED]] display, a [[battery (electricity)|battery]], and a [[buzzer]]—are visible.]]
  7 KB (1,067 words) - 18:11, 9 December 2011
• Source transformation
  ...urrent source and a real voltage source, such as a [[battery (electricity)|battery]]. Application of Thevenin's theorem and Norton's theorem gives the quanti
  4 KB (626 words) - 14:48, 10 December 2011
• Crystal radio
  ..., popular in the early days of radio. It needs no [[battery (electricity)|battery]] or power source and runs on the power received from [[radio waves]] by a ...a separate source of [[electric power]] such as a [[battery (electricity)|battery]] or the [[mains power]] to [[Amplifier|amplify]] the weak radio signal fro
  73 KB (10,437 words) - 14:50, 10 December 2011
• Programmable load
  ...oad regulation]], [[Battery_(electricity)#Battery_capacity_and_discharging|battery discharge]] curve measurement and [[Transient (oscillation)|transient tests
  1 KB (142 words) - 14:51, 10 December 2011
• Ammeter
  ...att-hour meters]]) or for estimating the charge of [[Battery (electricity)|battery]] or [[capacitor]]. ...ne side of the scale (commonly, the right side) and the discharging of the battery deflects the needle to the other side. A special type of zero-center ammete
  11 KB (1,552 words) - 14:51, 10 December 2011
• Galvanometer
  ...vanometer", in common use by 1836, was derived from the surname of Italian electricity researcher [[Luigi Galvani]], who discovered in 1771 that electric current ...al resistance|resistance]] by placing it in series with a known voltage (a battery) and an adjustable resistor. In a preparatory step, the circuit is complete
  20 KB (3,126 words) - 14:51, 10 December 2011
• Continuity tester
  ...ies with a source of electrical power - normally a [[Battery (electricity)|battery]], terminating in two [[test lead]]s.<ref name=one/><ref name=two/> If a co ..."buzzing out a circuit" (which means to test for continuity). A buzzer and battery are conencted to test leads, and if the wire or device between the leads ha
  4 KB (566 words) - 14:51, 10 December 2011
• ESR meter
  ...used, it may be used to measure the [[internal resistance]] of [[Battery (electricity)|batteries]] (batteries end their life largely due to increased internal re ...ut will minimise this risk (but the meter can no longer be used to measure battery internal resistance).
  8 KB (1,328 words) - 14:51, 10 December 2011
• Test light
  ...ctronic test equipment]] used to determine the presence or absence of an [[Electricity|electric]] [[voltage]] in a piece of equipment under test. ...to light the lamp and power the amplifier is supplied by a small internal battery, and does not flow through the user's body.
  10 KB (1,568 words) - 14:51, 10 December 2011
• Spectrum analyzer
  ...wn and unknown signals. The input signal a spectrum analyzer measures is [[electricity|electrical]], however, [[Frequency spectrum|spectral]] compositions of othe By analyzing the [[Frequency spectrum|spectra]] of [[electricity|electrical]] signals, dominant [[frequency]], [[Electric Power|power]], [[d
  20 KB (2,944 words) - 14:52, 10 December 2011
• Atomic clock
  | fuel_source = [[Electricity]] ...med that it requires just 75&nbsp;[[milliwatt|mW]], making it suitable for battery-driven applications. This device could conceivably become a consumer produc
  32 KB (4,699 words) - 14:52, 10 December 2011

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