Year 9 Electricity Review

What is Ohm's Law?

• V=IR

• V=R÷I

• I=V÷R

• R=IV

Answer explanation

Ohm's Law is:

Voltage = Current x Resistance

What does Ohm's Law describe?

• The relationship between charge and energy.

• The relationship between voltage, time, and power.

• The relationship between voltage, resistance, and current.

• The relationship between current, resistance, and time.

Answer explanation

Ohm's Law is:

V = IR

We can see that this equation shows us what voltage equals depending on the current and the resistance.

What is an accurate description of a conductor?

• A material that allows current to flow through it.

• A material that prevents current from flowing through it.

Answer explanation

A conductor allows current to flow through it. Some examples include:

• - Copper

• - Gold

• - Graphite

• - Saltwater

Tags

NGSS.HS-PS2-5

Describe the properties of an electrical insulator and provide two examples.

Answer explanation

An insulator is a material that does not allow electrical current to flow through it. Some examples include:

• - Plastic

• - Wood

• - Glass

In a​ (a)   circuit, the total current flows through each component.

• series
• parallel
• short
• long

In a​ parallel circuit, voltage is ​ (a)   across different components.

• the same
• shared
• split

The voltage output of this battery is 24V and the light globes are identical. What is the voltage across each light globe?

• 24V

• 12V

• 48V

• 6V

3 identical light bulbs are connected to a battery. Will they be brighter if connected in series or in parallel? Why?

Tags

NGSS.HS-PS3-1

Explain what voltage means using an example.

According to Ohm's Law, what happens to current if the resistance stays the same and the voltage increases

• current will decrease

• current will stay the same

• current will increase

• Ohm's Law doesn't include current.