Definitions

Question 1

Electric Currents

Answer 1

An electric current consists of a flow of charged particles.

The magnitude of the current in the circuit is equal to the rate of flow of charge through the circuit

Question 2

Charge

Answer 2

The charge Q which flows past a point in time t if there is a steady current (I) flowing is given by the equation Q=it

Question 3

The coulomb

Answer 3

It is defined as the quantity of charge which passes a conductor in 1s when a current of 1A is flowing

Question 4

E.m.f

Answer 4

It is defined as the energy dissipated by a source in driving unit charge round a complete circuit

Question 5

P.d

Answer 5

P.d between two points in a circuit is defined as the energy dissipated per unit charge flowing between two points

Question 6

Resistance

Answer 6

It is the property of a conductor which limits the current flow

Question 7

The ohm

Answer 7

Is defined as the resistance of a conductor which a current of 1A is flowing and p.d across it is 1V

Question 8

Ohm’s Law

Answer 8

The current through an ohmic conductor is directly proportional to the p.d across it provided that physical conditions are kept constant