energy transfer and electricity review 7P23

Mark likes to use a battery-powered radio to listen to music. Which types of energy transfer must take place in order for the radio to play music he can hear?

• chemical energy to electrical energy to sound energy

• chemical energy to sound energy to electrical energy

• electrical energy to chemical energy to sound energy

• sound energy to electrical energy to chemical energy

Answer explanation

The correct sequence of energy transfer for the radio to play music is from chemical energy to electrical energy to sound energy.

Imagine you're preparing for a long journey. You pack snacks, fill your car's fuel tank, and ensure all your devices are charged. What do these preparations have in common?

• They create energy.

• They store chemical energy.

• They produce chemical energy.

• They represent electromagnetic energy.

Answer explanation

The preparations of packing snacks, filling the car's fuel tank, and charging devices all involve storing chemical energy for the journey ahead.

In a remote-controlled car's circuit, which component is primarily responsible for storing the energy needed to operate?

• battery

• motor

• remote control

• wires

Answer explanation

The battery is primarily responsible for storing the energy needed to operate in a remote-controlled car's circuit.

Imagine you're setting up holiday lights at home. You connect one end of the lights to an electrical outlet and the other end back to the lights, and they illuminate. Which choice describes this setup?

• It is a short circuit.

• It is a closed circuit.

• It is an open circuit.

• It is a parallel circuit.

Answer explanation

The correct choice is 'It is a closed circuit' because the setup allows the flow of electricity from the outlet through the lights and back, completing a circuit.

Nayshaun kicks a soccer ball into a net. Which statement describes the energy involved in this action?

• Energy is created when his foot touches the soccer ball.

• Energy is destroyed when his foot touches the soccer ball.

• Energy is transferred when his foot touches the soccer ball.

• Energy is converted to matter when his foot touches the soccer ball.

Answer explanation

Energy is transferred when his foot touches the soccer ball.

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How is energy transferred within a flashlight when it is turned on during a camping trip at night?

• Light energy and thermal energy in the light bulb are transferred to chemical energy in the battery.

• Thermal energy in the battery is transferred to the light bulb, resulting in potential energy.

• Chemical energy in the battery is transferred to the light bulb, producing light and heat.

• Kinetic energy in the battery is transferred to the light bulb, releasing potential energy.

Answer explanation

The correct choice explains that chemical energy in the battery is transferred to the light bulb, producing light and heat.

When you pull back on the rubber band of a slingshot to launch a stone, what type of energy is being stored in the stretched band?

• gravitational potential energy

• elastic potential energy

• kinetic energy

• power

Answer explanation

When you pull back on the rubber band of a slingshot, elastic potential energy is being stored in the stretched band due to its deformation.

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Imagine a flashlight being used during a camping trip at night. Which set of statements best describes the flow of energy in this flashlight when it is turned on?

• Chemical energy in the batteries transfers into electrical energy through the wire to the light bulb. The electrical energy transfers to light energy in the bulb and then to electrical energy which flows back to the batteries.

• Thermal energy in the batteries transfers into electrical energy through the wire to the light bulb. The electrical energy transfers to light energy in the bulb and then to electrical energy which flows back to the batteries.

• Mechanical energy in the batteries transfers into light energy through the wire to the light bulb. Light energy transfers to electrical energy in the bulb and then to chemical energy which flows back to the batteries.

• Electromagnetic energy in the batteries transfers into light energy through the wire to the light bulb. Light energy transfers to electrical energy in the bulb and then to mechanical energy which flows back to the batteries.

Answer explanation

The correct choice is: Chemical energy in the batteries transfers into electrical energy through the wire to the light bulb. The electrical energy transfers to light energy in the bulb and then to electrical energy which flows back to the batteries.

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When a car engine runs, transforming chemical energy into mechanical energy, what is always created as a byproduct?

• heat

• light

• noise

• sound

Answer explanation

When a car engine runs, it transforms chemical energy into mechanical energy, creating heat as a byproduct.

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When a car accelerates, which statement best demonstrates the energy transfer occurring as the gasoline burns to power the engine?

• Chemical energy is converted to mechanical energy.

• Mechanical energy is converted to electrical energy.

• Electrical energy is converted to potential energy.

• Kinetic energy is converted to chemical energy.

Answer explanation

When a car accelerates, the energy transfer occurs as the gasoline burns to power the engine by converting chemical energy into mechanical energy.

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