What is one effect of electric current on a conductor?

• It produces light.

• It causes the conductor to expand.

• It increases the resistance.

• It generates heat.

How does electric current produce a magnetic field?

• Electric current produces a magnetic field due to the movement of charged particles.

• Electric current creates a magnetic field by generating heat.

• Electric current can only flow in a vacuum without creating a magnetic field.

• Magnetic fields are produced by static electricity only.

What is the heating effect of electric current called?

• Capacitive heating

• Joule heating

• Electromagnetic induction

• Thermal conduction

Name a common device that uses the heating effect of current.

• Air conditioner

• Refrigerator

• Electric fan

• Electric heater

What happens to a compass when placed near a current-carrying wire?

• The compass needle remains unaffected by the wire.

• The compass needle deflects due to the magnetic field from the current-carrying wire.

• The compass needle points in the opposite direction.

• The compass needle spins uncontrollably.

Explain how electric current can cause chemical reactions.

• Electric current causes chemical reactions by facilitating electrolysis, leading to oxidation and reduction at the electrodes.

• Electric current is used solely for powering devices, not for chemical processes.

• Chemical reactions occur spontaneously without any external influence.

• Electric current generates heat, which can melt metals.

What is the role of a fuse in an electrical circuit?

• The role of a fuse in an electrical circuit is to protect the circuit from overcurrent by breaking the circuit when the current exceeds a safe level.

• To store electrical energy for later use.

• To increase the voltage in the circuit.

• To convert AC to DC power.

Describe the relationship between current and magnetic field strength.

• Magnetic field strength is directly proportional to the electric current.

• Magnetic field strength is independent of the electric current.

• Magnetic field strength is inversely proportional to the electric current.

• Magnetic field strength decreases as electric current increases.

What is an electromagnet and how is it created?

• An electromagnet is a type of magnet that is created by electric current flowing through a coil of wire.

• An electromagnet is created by heating a metal until it becomes magnetic.

• An electromagnet is a permanent magnet made from iron.

• An electromagnet is a type of battery that stores electrical energy.

How does the resistance of a wire affect the heating effect of current?

• Heating effect is constant regardless of resistance changes.

• The heating effect is unaffected by the resistance of the wire.

• Higher resistance reduces the heating effect of current.

• The heating effect increases with higher resistance for a given current.