Electrical Units

You will be required to work out alternative units in the exam for all units of measurement, you can do this from equations or you can learn it. As there is no superscript the '^' sign means to the power of eg. Js^-1 is also the same as J/s

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Resistance is mainly measured in ohms but can also be measured in which other unit?
Volts per amp (VA^-1) because of ohms law (V=IR). To find resistance you rearrange the equation to give you R=V/I. So the units of Pd (voltage) are Volts and current (I) Amps.
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Voltage or Potential difference is measured in Volts so what other unit can it be measured in?
The answer is Joules per Columb (JC^-1) This can be remembered easily by saying that voltage is the Anti-Christ as it's J/C
2 of 5
Power is measured in watts but how else could you represent it's units?
Power is equal to Energy/Time. Energy is measured in joules and time in seconds so it can also be represented in Joules per Second (Js^-1)
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Current is measured in Amps, but how else could you represent it's units?
Columbs per second due to equation Current = Charge/Time (I=Q/t)
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Conductance is measured in Siemens but how else could you represent it?
Amps per Volt (AV^-1) because of equation G=I/V
5 of 5

Other cards in this set

Card 2

Front

Voltage or Potential difference is measured in Volts so what other unit can it be measured in?

Back

The answer is Joules per Columb (JC^-1) This can be remembered easily by saying that voltage is the Anti-Christ as it's J/C

Card 3

Front

Power is measured in watts but how else could you represent it's units?

Back

Preview of the front of card 3

Card 4

Front

Current is measured in Amps, but how else could you represent it's units?

Back

Preview of the front of card 4

Card 5

Front

Conductance is measured in Siemens but how else could you represent it?

Back

Preview of the front of card 5

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