1. Define the SI unit of (one mark each)
(a) Current
(b) Potential Difference
(c) Resistance
(d) Electric Power
(e) Electric Energy (Commercial)

(a) 1 Ampere - 1 Ampere is defined as when 1 coulomb charge is divided by 1 second of time.
(b) 1 Volt - 1 Volt is defined as when 1 Joule of work is divided by 1 coulomb of charge.
(c) 1 Ohm - 1 Ohm is defined as when 1 Volt of potential difference is divided by 1 Ampere of current.
(d) 1 Watt - 1 Watt of power is defined as when 1 Joule of consumed energy is divided by 1 second of time.
(e) 1 kWh - 1 kWh is the amount of electric energy consumed when an electric appliance having a power rating of 1 kW is used for 1 hour.

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SI unit of current is ampere.
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SI unit of resistance is ohm.
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SI unit of potential difference is volt.
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SI unit of electric power is whatts. ..
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SI unit of electric energy ( commercial ) is kwh.
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