Electricity Unit

How does the extension cord help the fan work?

• The extension cord makes the fan more powerful.

• The extension cord makes the fan easier to operate.

• The extension cord transfers sound energy to the fan.

• The extension cord transfers electric currents from the outlet to the fan.

Answer explanation

The extension cord transfers electric currents from the outlet to the fan, enabling it to work.

A flow of electrical charges is known as

• resistance

• electrical current

• static electricity

• O voltage

Answer explanation

Electrical current refers to the flow of electrical charges.

An electric fence used to contain cattle works by transmitting energy through a conductor creating an electric___________

• Sound wave

• Electric field

• Magnetic field

• Electric current

Answer explanation

An electric fence works by transmitting energy through a conductor, creating an electric current. This current creates a barrier that contains cattle.

Tags

NGSS.MS-PS2-5

In an electric circuit, a battery can act as a

• voltage source

• conductor

• insulator

• O resistor

Answer explanation

A battery in an electric circuit acts as a voltage source, providing the electrical potential difference needed for current flow.

A conductor is a

• a material that increases the number of charged particles

• material that increases the amount of electricity

• material through which electricity flows easily

• material that stops the flow of energy

Answer explanation

A conductor is a material through which electricity flows easily.

You are asked to design a product that will change electrical energy to heat energy. Choose the item you would research while developing your product.

• Hair dryer

• Alarm clock

• Ceiling fan

• Cell phone

Answer explanation

The item to research while developing a product that changes electrical energy to heat energy is a hair dryer. It is designed specifically for this purpose.

Tags

NGSS.MS-PS3-3

What conclusion can you draw from Amy touching the generator?

• Charged particles are being pulled from the air.

• Charged particles are being pulled from the floor.

• Charged particles are being destroyed.

• Charged particles are being moved from one object to another.

Answer explanation

Amy touching the generator causes charged particles to move from one object to another.

Tags

NGSS.MS-PS2-5

A switch in a circuit

• acts as an insulator

• absorbs electricity

• allows or stops the flow of electricity

• keeps the flow of electricity at a safe level

Answer explanation

A switch in a circuit allows or stops the flow of electricity. It controls the circuit by opening or closing the pathway for the current to flow.

An object in an electrical circuit that resists the flow of energy is called

• a magnet

• a compass

• a voltage

• a resistor

Answer explanation

A resistor is an object in an electrical circuit that resists the flow of energy.

Earth's primary source of light energy is

• 
• 
• 
• 

Tags

NGSS.MS-ESS1-1