Chp 4 - Electricity

Open Ended

Why is electricity important to us?

Multiple Choice

Which of the following is NOT a learning objective mentioned in the lesson 'Why is Electricity Important to Us?'

• Describe electrical energy as a useful form of energy in our daily lives

• Explain the process of photosynthesis in plants

• Describe the generation and transmission of electricity with reference to energy conversions in power stations

• Show care and concern for the environment by using electricity responsibly

Open Ended

Explain how electrical appliances make our lives more comfortable, using examples from the lesson.

Fill in the Blank

Electrical energy can be stored as chemical potential energy in ___ and power banks.

Multiple Select

Which of the following are reasons why electrical energy is commonly used?

• It can be transmitted easily using wires and cables

• It is always cheaper than other forms of energy

• It can be easily converted to other forms of energy

• It can be stored as chemical potential energy in batteries and power banks

Open Ended

Why is electrical energy a useful form of energy?

Multiple Select

Which of the following are possible energy conversions in electrical appliances?

• Electrical energy to heat energy

• Electrical energy to kinetic energy

• Electrical energy to chemical energy

• Electrical energy to light and sound energy

Multiple Choice

Which of the following appliances converts electrical energy to thermal energy?

• Electric kettle

• Electric fan

• Mobile phone

• Blender

Multiple Select

Which of the following appliances convert electrical energy to kinetic energy?

• Blender

• Electric fan

• Toaster oven

• Washing machine

Open Ended

Explain how electrical energy is converted to sound energy in an audio system.

Fill in the Blank

A lamp converts electrical energy to ___ energy.

Open Ended

Describe the process by which electricity generated at power stations reaches homes and offices in Singapore.

Multiple Choice

What is the main source of fuel used in Singapore's power stations to produce electricity?

• Natural gas

• Coal

• Solar energy

• Wind energy

Multiple Choice

Where does the electricity supplied to our homes come from?

• Burning fossil fuels

• Solar panels

• Wind turbines

• Hydroelectric dams

Open Ended

Describe the process of how electricity is generated in a power station and distributed to homes and offices.

Multiple Choice

Which of the following correctly lists the sequence of energy conversions in a power station?

• Chemical potential → Thermal → Kinetic (steam) → Kinetic (turbine) → Electrical

• Thermal → Chemical potential → Kinetic (turbine) → Electrical

• Kinetic (turbine) → Chemical potential → Electrical → Thermal

• Electrical → Kinetic (steam) → Thermal → Chemical potential

Fill in the Blank

Light energy from the sun is converted into electrical energy using ___.

Multiple Select

Which of the following are renewable sources of energy used to generate electricity?

• Wind

• Running water

• Biomass

• Coal

Open Ended

State the energy conversion that takes place when fossil fuels are combusted. From ___ energy to ___ energy.

Open Ended

Explain how burning fossil fuels to generate electricity can impact the environment.

Multiple Choice

Why is it important to reduce wastage of electrical energy in Singapore?

• Because Singapore depends heavily on imported fossil fuels and they are non-renewable.

• Because Singapore produces all its own energy from renewable sources.

• Because electricity is very cheap in Singapore.

• Because Singapore has unlimited fossil fuel resources.

Fill in the Blank

We can reduce electrical energy wastage by using appliances that are more ___-efficient.

Multiple Select

Which of the following are ways to reduce wastage of electrical energy?

• Turn off electrical appliances when not in use.

• Use air-conditioners instead of fans when feeling hot.

• Use energy-efficient appliances.

• Open windows to let in natural light and air.

Multiple Choice

Which of the following statements about the evolution of light bulbs is correct?

• LED bulbs convert up to 80% of electrical energy into light energy.

• Incandescent bulbs convert more energy into light than fluorescent bulbs.

• Fluorescent bulbs last longer than LED bulbs.

• Incandescent bulbs are the most energy-efficient.

Open Ended

Describe two reasons why LED light bulbs are considered better than incandescent and fluorescent bulbs.

Fill in the Blank

Electricity is important to us because it ___.

Open Ended

Which question from Chapter 4 Electricity do you find most interesting and why?