Chapter 12 - Electrical energy - AO1

The unit of electrical resistance is the

• amp (A)

• ohm (Ω)

• volt (V)

• joule (J)

Which of these changes will decrease the resistance of a metal wire?

• increasing the length of the wire

• increasing the cross-sectional area of the wire

• increasing the temperature of the wire

• increasing the current in the wire

How much is 1 mA?

• 1000 A

• 100A

• 0.001A

• 0.000001A

How much is 1kV?

• 10 V

• 0.001V

• 10,000 V

• 1000 V

What is the word used to define the ratio of flow of charge through a circuit?

• electromotive force

• component

• electric current

• resistance

What is the name of this measuring instrument?

• amperemeter

• ammeter

• amometer

• currentmeter

Dry human skin is a good ...

• electric conductor

• electric insulator

• electric semiconductor

• electric superconductor

Voltmeters are always connected ...

• in parallel

• in series

• with copper wires

• after a battery

This is the symbol used for a ...

• battery

• capacitor

• resistor

• cell

The equation relating voltage, current and resistance is ...

• V = R / I

• V x I = R

• R = (1/V) / (1/I)

• R = V/I