Q1 of 330 Page 18

Name the law which relates the current in a conductor to the potential difference across its ends.

The law stating that the direct current flowing in a conductor is directly proportional to the potential difference between its ends. It is usually formulated as V = IR. This law is called Ohm's law.


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34

An electric heater is connected to the 230 V mains supply. A current of 8A flows through the heater.

(a) How much charge flows around the circuit each second?


(b) How much energy is transferred to the heater each second?

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How many electrons are flowing per second past a point in a circuit in which there is a current of 5 amp ?

 2

Name the unit of electrical resistance and give its symbol.

 3

Name the physical quantity whose unit is "ohm".