Gr 9 - Electricity Review 1

Question 1

What is this?

Accepted Answer

Rheostat (variable resistor)

Question 2

Adding another load to a Parallel circuit will...

Accepted Answer

Decrease resistance and increase current

Question 3

Which of these are parallel circuits?

Accepted Answer

the bottom two

Question 4

According to Ohm's Law, when resistance is high...

Accepted Answer

current is low

Question 5

Adding another load to a Series circuit will...

Accepted Answer

Increase resistance and decrease current

Question 6

Simple and easy to build, and uses less material is an advantage of what type of circuit?

Accepted Answer

Series circuits

Question 7

The current is 10A, and the voltage is 20V. What is the resistance of the radio?

Accepted Answer

2Ω

Question 8

Why are resistors important?

Accepted Answer

Decreases current to protect from fires and overload

Question 9

Which way do the electrons flow in this circuit?

Accepted Answer

Counter-clockwise

Question 10

The current is 7A, and the resistance of your toaster is 30Ω. What voltage do you need?

Accepted Answer

210 V

Question 11

Lightning is an example of...

Accepted Answer

an electrical discharge

Question 12

What is this?

Accepted Answer

a light

Question 13

What is this?

Accepted Answer

2-cell battery

Question 14

Current is measured in....

Accepted Answer

Amperes (A)

Question 15

What is electricity?

Accepted Answer

the movement of electrons from one place to another

Question 16

What is Ohm's Law?

Accepted Answer

V = I × R

Question 17

Resistance is measured in...

Accepted Answer

Ohms (Ω)

Question 18

According to Ohm's Law, when voltage is low...

Accepted Answer

current is also low

Question 19

What is a sudden and unpredictable movement of electrons called?

Accepted Answer

Electrical Discharge

Question 20

Why do insulators prevent the movement of electrons?

Accepted Answer

Because the nuclei holds onto the electrons very tightly.

Question 21

If there is a break in this circuit, only parts of the circuit is affected.

Accepted Answer

Must be a Parallel Circuit

Question 22

If there is any break in this type of circuit, the whole circuit will fail.

Accepted Answer

Must be a Series Circuit

Question 23

Why do only electrons move and not protons?

Accepted Answer

Protons are too fat

Question 24

Like charges repel, and opposite charges attract. This is...

Accepted Answer

the Law of Electrical Charges

Question 25

The voltage in your home is 120V, and the resistance of your light is 15Ω. What is the current?

Accepted Answer

8A

Question 26

Why do we use current electricity and not static electricity in our technology?

Accepted Answer

Current is more predictable and easier to control.

Question 27

Which of these are series circuits?

Accepted Answer

The top right

Question 28

How difficult it is for electrons to flow through a circuit is called...

Accepted Answer

Resistance

Question 29

All circuits have 4 basic parts. Which of these is not one of those?

Accepted Answer

Resistor

Question 30

A disadvantage of Parallel circuits is that it takes more material to build.

Accepted Answer

True

Question 31

What is this?

Accepted Answer

A series circuit

Question 32

Which of these is not an example of a variable resistor?

Accepted Answer

Lightbulb

Question 33

You put your very negative friend next to the wall and after a while they stick to it. Why?

Accepted Answer

The negative charges in the wall has been repelled.

Question 34

Which of these is a conductor?

Accepted Answer

Pop can

Question 35

Which one is not a possible electrical charge?

Accepted Answer

Ground

Gr 9 - Electricity Review 1

Questions 35

Gr 9 - Electricity Review 1

Questions 35