Exercises - Electric circuits, Grade 10 Physics
E - 1. Write definitions for each of the following

1.1 resistor
1.2 coulomb
1.3 voltmeter

E - 2. Draw a circuit diagram which consists of the following components:
2.1 2 batteries in parallel
2.2 an open switch
2.3 2 resistors in parallel
2.4 an ammeter measuring total current
2.5 a voltmeter measuring potential difference across one of the parallel resistors

E - 3. Complete the table below:

E - 4. The emf of a battery can best be explained as the . . .
4.1 rate of energy delivered per unit current
4.2 rate at which charge is delivered
4.3 rate at which energy is delivered
4.4 charge per unit of energy delivered by the battery

E - 5. Which of the following is the correct definition of the emf of a cell?
5.1 It is the product of current and the external resistance of the circuit.
5.2 It is a measure of the cell’s ability to conduct an electric current.
5.3 It is equal to the “lost volts” in the internal resistance of the circuit.
5.4 It is the power dissipated per unit current passing through the cell.

E - 6. Three identical light bulbs A, B and C are connected in an electric circuit as shown in the diagram below.

How do the currents in bulbs A and B change when switch S is opened?


E - 7. When a current I is maintained in a conductor for a time of t, how
many electrons with charge e pass any cross-section of the conductor per second?
7.1 It
7.2 It/e
7.3 Ite
7.4 e/It

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Physics 10.IX Electric Circuits

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