4F - 8. Electromagnetism

What happens to electrons when they pass through a conductor?

• They become static.

• They create a magnetic field.

• They collide with atoms and lose energy.

• They gain energy and move faster.

What is the combined resistance of resistors in series?

• It is the average of all resistances.

• It is the sum of all resistances.

• It is the maximum resistance.

• It is the product of all resistances.

What is the effect of connecting resistors in parallel?

• It increases the total resistance.

• It decreases the total resistance.

• It keeps the resistance constant.

• It doubles the resistance.

What is the formula for power in an electrical circuit?

• P = E × t

• P = V + I

• P = V × I

• P = R × I

What is the SI unit of power?

• Joule

• Watt

• Volt

• Ampere

What principle is used in electromagnets?

• Electric current produces a magnetic field.

• Electric fields repel magnetic fields.

• Magnetic fields produce electric current.

• Magnetic fields can only exist in vacuum.

What happens when a wire is moved across a magnetic field?

• It decreases current.

• It increases resistance.

• It generates an e.m.f. (voltage).

• It creates a static charge.

What is electromagnetic induction?

• The process of creating static electricity.

• The attraction between electric and magnetic fields.

• The generation of electric current from a changing magnetic field.

• The conversion of electrical energy into heat.

How does increasing the current affect the magnetic field produced by a coil?

• It reverses the direction of the field.

• It increases the strength of the field.

• It has no effect on the field.

• It decreases the strength of the field.

What is the relationship between electricity and magnetism called?

• Magnetostatics

• Electromagnetism

• Electrostatics

• Electrokinetics