GCSE Physics - How the Electric Motor Works #80

The video explains how electric motors work, focusing on the motor effect where a current-carrying wire in a magnetic field experiences a force. The direction of this force depends on the current and magnetic field directions, determined by Fleming's left hand rule. A coil with current flowing through it experiences forces that cause it to rotate. To maintain continuous rotation, a split ring commutator swaps the current direction every half turn. This principle is used in various motors, and their power can be increased by adjusting current, coil turns, or magnetic flux density.

What rule helps determine the direction of force on a current-carrying wire in a magnetic field?

• Newton's third law

• Fleming's left-hand rule

• Ohm's law

• Fleming's right-hand rule

What happens to a coil in a magnetic field when the current direction changes after a 180-degree rotation?

• The coil continues to rotate in the same direction

• The coil stops rotating

• The coil starts rotating in the opposite direction

• The coil rotates faster

What device is used to ensure that a coil in an electric motor rotates continuously in one direction?

• Magnetic switch

• Brushless motor

• Induction coil

• Split ring commutator

Which of the following is NOT a way to increase the power of an electric motor?

• Increasing the magnetic flux density

• Using weaker magnets

• Adding more turns to the coil

• Increasing the current

Electric motors are commonly used in which of the following devices?

• Solar panels

• Wind turbines

• Hard drives

• Batteries