Electricity and Magnetism

What is the SI unit of electric current?

• B

• C

• D

• A

Explain the difference between series and parallel circuits.

• Series circuit has components connected side by side, while parallel circuit has components connected vertically.

• Series circuit has components connected across each other, while parallel circuit has components connected end-to-end.

• Series circuit has components connected end-to-end, while parallel circuit has components connected across each other.

• Series circuit has components connected in a loop, while parallel circuit has components connected in a straight line.

State the right-hand rule for magnetic fields.

• If you point your thumb in the direction of the current, then the direction in which your fingers curl represents the direction of the magnetic field.

• If you point your thumb in the direction of the magnetic field, then the direction in which your fingers curl represents the direction of the current.

• The direction of the magnetic field is always opposite to the direction of the current.

• The strength of the magnetic field is determined by the number of turns in the wire.

Define electric potential and explain its significance.

• Electric potential is the speed at which electric charges move through a circuit.

• Electric potential is the amount of work needed to move a unit positive charge from a reference point to a specific point in an electric field.

• Electric potential is the measure of the amount of charge in an electric field.

• Electric potential is the force exerted by an electric field on a charged particle.

What is the relationship between voltage, current, and resistance in a circuit?

• V = I + R

• V = R / I

• V = I * R

• V = I / R