L2 EAL Unit 003 Revision 3

What is the unit of electrical resistance?

• Ohm

• Volt

• Ampere

• Watt

Which material is commonly used as an electrical conductor?

• Rubber

• Plastic

• Copper

• Wood

What does a voltmeter measure?

• Current

• Voltage

• Resistance

• Power

What is the formula for calculating power in an electrical circuit?

• P = V/I

• P = V^2/R

• P = IV

• P = IR

Answer explanation

The correct formula for calculating power (P) in an electrical circuit is P = IV, where I is the current and V is the voltage. This formula shows that power is the product of current and voltage.

What does the term "ductility" refer to in materials science?

• Hardness

• Ability to conduct electricity

• Ability to be stretched into a wire

• Brittleness

Which law states that the current through a conductor is directly proportional to the voltage across it?

• Newton's Law

• Ohm's Law

• Coulomb's Law

• Faraday's Law

What is the primary purpose of a fuse in an electrical circuit?

• To generate power

• To store energy

• To protect the circuit from overcurrent

• To measure voltage

What is the standard unit of frequency?

• Hertz

• Tesla

• Joule

• Pascal

Which of the following is an example of a ferromagnetic material?

• Copper

• Aluminium

• Iron

• Silver

What is the chemical symbol for aluminium?

• Al

• Au

• Ag

• Am