The Motor Principle

If your reverse the direction of the current running in the wire, the magnetic field around the wire _____________________________. 

• stop existing

• also reverse direction

• becomes perpendicular to the length of the wire

• becomes parallel to the length of the wire 

Why do loops of wire in a motor rotate? 

• Because the battery effectively pushes a loop around. 

• Because the magnetic fields exerts forces in the moving electrons in the loop. 

• Because the magnet attracts stationary electrons in the wire. 

• Because current exerts a force on the loop. 

What is an armature?

• a rotating coil

• a device that reverses the direction of the flow of current 

• a device that measures potential energy

• a device that measures the flow of electrons

It refers to the flow of electrons in a wire.

• current

• magnetism

• voltage

• resistance

What is/are the particle/s inside the nucleus of an atom?

• electron and neutron

• proton, electron, neuron

• electron

• proton and neutron

Which of the following sources can electricity be generated?

• sun

• nuclear energy

• fossil fuel

• all of the choices

What is a voltmeter?

• a device that measures voltage

• a device that measures electromotive force

• a device that measures potential energy

• all of the choices

It is used to measure the current of electricity.

• Ammeter

• Loudspeaker

• Voltmeter

• Ohmmeter

Which of the following devices is/are an application of the Motor Principle? 

• Loudspeaker

• Electric Motor

• Voltmeter

• All of the choices

Which of the following device converts electrical energy to mechanical energy? 

• Electric motor

• Transformer

• Generator

• Galvanometer