What is magnetism?
Invisible lines of pressure
Invisible lines of force
Invisible lines of power
The magnetic materials are:
Steel
Iron
Copper
Silver
Nickel
Cobalt
Aluminium
You can increase the strength of an electromagnet by increasing the strength of the and the .
What is voltage?
A measure of pressure
A measure of force
A measure of current
A measure of electrical energy
What is current?
The rate of flow of electrons
How many windings there are on the electromagnet
The strength of the commutator
What is Resistance?
Current multiplied by voltage
A measure of how much the flow is prevented
A measure of the time it takes for the electric motor to reach its full capacity
What is given off when current passes through a resistor?
Force
Steam
Smell
Heat
Vibration
A current passes through a resistor of 25 Ohm's with 100 volts. What is the strength of the current?
2 amps
3 amps
4 amps
5 amps
6 amps
