Understanding Voltage: A Quiz

What is voltage?

• The flow of free electrons between atoms

• A measure of electrical resistance

• What pushes free electrons around a circuit

• A type of electrical appliance

How can voltage be imagined in a physical analogy?

• The speed of a flowing river

• As pressure in a water pipe

• Like the brightness of a light bulb

• The height of a water tank

What happens when voltage is applied to a circuit?

• Free electrons move randomly

• The circuit becomes insulated

• The circuit overheats

• Free electrons move in the same direction, causing current

What is the unit used to measure voltage?

• Watts

• Amps

• Ohms

• Volts

What does a higher voltage in a circuit imply?

• Lower current flow

• More current can flow

• No change in current flow

• The circuit will short-circuit

What is the difference between direct and alternating voltage?

• Direct voltage varies over time, while alternating voltage is constant

• Alternating voltage can only be used in batteries

• Direct voltage moves electrons in one direction, while alternating voltage changes direction

• There is no difference

How is voltage related to potential difference?

• Potential difference is the amount of current flowing through a circuit

• Voltage measures resistance, while potential difference measures pressure

• They are unrelated terms

• Voltage is the potential difference between two points

Why do voltages vary around the world?

• Due to differences in natural resources

• Due to the rotation of the Earth

• Voltage does not vary around the world

• Because of historical distribution network choices