Energy Transformations Quiz

Explain how solar panels convert sunlight into electricity.

• By using geothermal energy to power the panels and generate electricity

• By using nuclear fission to create a reaction that produces electricity

• By using the photovoltaic effect to generate a flow of electricity

• By using wind turbines to capture the energy and convert it into electricity

Answer explanation

Solar panels convert sunlight into electricity by using the photovoltaic effect to generate a flow of electricity.

What is an example of a chemical energy transformation?

• Boiling water to release light energy

• Freezing water to release sound energy

• Burning wood to release heat energy

• Melting ice to release electrical energy

Answer explanation

Burning wood is an example of a chemical energy transformation, where heat energy is released.

Describe the process of burning wood as a chemical energy transformation.

• Chemical energy in wood is transformed into nuclear and mechanical energy

• Chemical energy in wood is transformed into heat and light energy

• Chemical energy in wood is transformed into sound and kinetic energy

• Chemical energy in wood is transformed into potential and electrical energy

Answer explanation

Burning wood converts chemical energy into heat and light energy, making it the correct choice.

How is mechanical energy transferred from one object to another?

• Through direct contact or mechanical devices

• Through electromagnetic radiation

• Through sound waves

• Through chemical reactions

Answer explanation

Mechanical energy is transferred from one object to another through direct contact or mechanical devices.

Give an example of mechanical energy transfer in everyday life.

• Riding a bicycle

• Reading a book

• Cooking dinner

• Watching TV

Answer explanation

Riding a bicycle is an example of mechanical energy transfer in everyday life. When you pedal, the mechanical energy from your legs is transferred to the wheels, propelling the bicycle forward.

What is the role of electrical transformers in electrical energy conversion?

• Voltage conversion

• Temperature conversion

• Color conversion

• Sound conversion

Answer explanation

Electrical transformers play a crucial role in converting voltage, making them essential in electrical energy conversion.

Explain how a generator converts mechanical energy into electrical energy.

• By heating a metal wire until it produces electricity.

• By using water pressure to spin a turbine connected to a wire coil.

• By using a magnetic field to induce a current in a wire loop or coil as it rotates within the field.

• By using a series of mirrors to focus sunlight onto a wire coil.

Answer explanation

A generator converts mechanical energy into electrical energy by using a magnetic field to induce a current in a wire loop or coil as it rotates within the field.

How does thermal energy transfer occur in a convection oven?

• By the absorption of heat by the oven racks

• By the conduction of heat through the food

• By the movement of hot air circulating around the food

• By the radiation of heat from the oven walls

Answer explanation

Thermal energy transfer in a convection oven occurs by the movement of hot air circulating around the food.

Describe the process of heat transfer in a metal spoon when placed in hot soup.

• Conduction

• Convection

• Reflection

• Absorption

Answer explanation

Heat is transferred through the metal spoon by conduction when it comes into direct contact with the hot soup.