9.2 Current and Voltage in Circuits

What is voltage?

• The amount of electric current in a circuit

• The electrical energy supplied to a circuit

• The resistance in a circuit

• The power used by a circuit

What is the unit of voltage?

• Ampere

• Ohm

• Watt

• Volt

What is the symbol for volts?

• W

• V

• A

• Ω

A battery is made of:

• One cell

• Two or more cells connected in series

• A single power source

• A generator

How many volts does a typical cell supply?

• 3 V

• 6 V

• 1.5 V

• 9 V

What is mains voltage?

• Voltage supplied by a battery

• Voltage from a power station or generator

• The voltage of a single cell

• The voltage measured across a resistor

What is the typical mains voltage in most countries?

• 1.5 V

• 6 V

• 220–240 V

• 12 V

In some countries, the mains voltage is: a) 12 V b) 110–120 V c) 6 V

• 12 V

• 110–120 V

• 6 V

What device is used to measure voltage?

• Ammeter

• Voltmeter

• Ohmmeter

• Wattmeter

How is a voltmeter connected in a circuit?

• In series

• In parallel

• In any way

• In a loop