Exploring Electric Current

What is one effect of electric current on a conductor?

• It generates heat.

• It causes the conductor to expand.

• It increases resistance.

• It produces light.

How does electric current produce a magnetic field?

• Magnetic fields are produced by the resistance of materials to electric flow.

• Electric current creates a magnetic field through static charge.

• Electric current generates a magnetic field only in superconductors.

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

What is the heating effect of electric current known as?

• Faraday's Law

• Ohm's Law

• Joule heating

• Thermal conductivity

What device uses the heating effect of current to cook food?

• Toaster

• Electric stove or electric oven

• Microwave oven

• Slow cooker

What is the principle behind electromagnetic induction?

• Electromagnetic induction occurs only in superconductors.

• A constant magnetic field creates an electric current in a conductor.

• The principle behind electromagnetic induction is that a changing magnetic field induces an electromotive force (EMF) in a conductor.

• A changing electric field induces a magnetic field in a conductor.

Which scientist is known for his work on electromagnetic induction?

• Michael Faraday

• Nikola Tesla

• Albert Einstein

• Isaac Newton

What happens to a compass needle when an electric current flows nearby?

• The compass needle spins rapidly in circles.

• The compass needle remains stationary.

• The compass needle points directly to the electric source.

• The compass needle deflects from its normal position.

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

• To convert AC to DC in the circuit.

• To store electrical energy for later use.

• 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 increase the voltage in the circuit.

How can electric current cause chemical reactions?

• Chemical reactions occur without any external energy.

• Electric current can only produce heat.

• Electric current causes chemical reactions through electrolysis.

• Electric current is used solely for powering devices.

What is the term for the flow of electric charge?

• Electric resistance

• Electric field

• Electric voltage

• Electric current