Test 3: Complete Chapter – Calculations, Safety and Applications

Question 1

The device used to measure electric current:

• Avoltmeter
• Bammeter
• Cohmmeter
• Dwattmeter

Question 2

What is the function of an electromotive force (e.m.f.) source in a circuit?

• ATo reduce resistance in the circuit
• BTo provide energy to drive charges through the circuit
• CTo store electrical energy for later use
• DTo convert electrical energy into mechanical energy

Question 3

A battery does 120 J of work to move a charge of 20 C through a circuit. The potential difference is:

• A6 V
• B2400 V
• C0.17 V
• D100 V

Question 4

A charge of 12 C flows through a wire in 4 s. The current is:

• A48 A
• B3 A
• C0.33 A
• D8 A

Question 5

Resistors of 2 ohm, 3 ohm and 5 ohm in series have total resistance:

• A10 ohm
• B1.0 ohm
• C30 ohm
• D0.97 ohm