Electricity Basics: 17 MCQs with answers

Ampere

Electric current is measured in amperes (A), named after André-Marie Ampère.

Switch

A switch is a device that can break or complete the circuit, controlling the flow of current.

To provide energy to drive the current

A cell or battery supplies electrical energy, creating a potential difference that drives current through the circuit.

Copper

Copper is a metal and has free electrons, making it a good conductor of electricity.

Ohm

Resistance is measured in ohms (Ω), named after Georg Simon Ohm.

Wood

Wood does not have free electrons, so it is an insulator and poor conductor.

Electric current

An ammeter is connected in series to measure the current flowing through a circuit.

Volt

Potential difference is measured in volts (V), named after Alessandro Volta.

Voltmeter

A voltmeter is connected in parallel to measure the potential difference across a component.

True

In a series circuit, there is only one path for current, so the current is the same everywhere.

Two or more long and short line pairs

A battery symbol consists of multiple cells, each shown as a long and short line pair.

Fuse

A fuse melts and breaks the circuit when current exceeds a safe level, protecting appliances.

From positive to negative terminal

Conventional current is defined as flowing from the positive terminal to the negative terminal, opposite to electron flow.

A zigzag line

A resistor is commonly represented by a zigzag line in circuit diagrams.

The circuit breaks and all bulbs go off

In a series circuit, removing one bulb breaks the path, so current stops flowing and all bulbs go off.

Each component has its own separate path

In a parallel circuit, each component is connected across the same voltage, providing independent paths.

False

A fuse is connected in series so that all the current passes through it, allowing it to break the circuit when current is excessive.