Electricity & Electromagnets

A volt is a unit of

• Electric energy

• potential difference

• work

• power

What does the switch do in a circuit?

• It supplies the power.
• It carries electricity.
• It opens and closes the circuit.
• It is an insulator.

measure of resistance

• watt
• ohm
• volt
• amp

measure of electric current

• watt
• ohm
• volt
• amp

An example of a parallel circuit is

• the wiring in a house
• a flashlight
• a single circular path
• a string of old Christmas lights

In Figure 21-2 above, which circuit is wired in series?

• circuit A
• circuit B
• both circuit A and B
• neither A nor B

Tags

NGSS.HS-PS2-5

Calculate the electric power of an electrical appliance of 20 V having a resistance of 10 ohms.
 
Remember: I=V/R and P=VI

• 200 W
• 80 W
• 2.5 A
• 79.20 KJ

In a cell, which form of energy is converted into electrical energy?

• Chemical energy
• Solar energy
• Mechanical energy
• Electrical energy

Tags

NGSS.HS-PS1-4

When you remove a bulb from a three bulb circuit, and the other two bulbs go off, then the bulbs must have been connected in __________.

• parallel
• series
• open
• closed

When we turn the switch to the off position the circuit is __________.

• closed
• open
• negative, positive
• overload

Tags

NGSS.HS-PS2-5