2.4.2 Energy Transfer

• In electrical appliances, electrical energy is typically converted into forms like heat, light, sound, or kinetic energy.
• In electrical appliances, energy transformation involves converting electrical energy into other forms like heat, light, sound, or kinetic energy.
• Match the energy conversion with the appliance:

  Electrical to Heat ↔️ Kettle

  Electrical to Light and Heat ↔️ Light bulb

  Electrical to Kinetic Energy ↔️ Electric Motor
• A kettle uses electrical energy to heat water.


  True
• What type of radiation is used in a microwave oven?

  Microwave
• Which appliance emits both heat and light when electrical energy is supplied?

  Light bulb
• A kettle uses electrical energy to heat water.


  True
• A kettle uses electrical energy to heat water
• What is energy transfer in electrical appliances?

  Change of energy form
• What is energy transformation in electrical appliances?

  Electrical to other forms
• An electric motor converts electrical energy into kinetic energy.
• An electric motor converts electrical energy into kinetic energy.


  True
• Match the appliance with its energy input and output:

  Kettle ↔️ Electrical to Heat

  Light bulb ↔️ Electrical to Heat and Light

  Electric Motor ↔️ Electrical to Kinetic Energy
• Which appliance converts electrical energy into sound?

  Loudspeaker
• What type of energy transformation occurs in a kettle?

  Electrical to Heat
• A light bulb converts electrical energy into light and heat.


  True
• What type of energy conversion occurs in a light bulb?

  Electrical to Light and Heat
• The formula to calculate energy consumed is Power x Time
• Heat losses reduce the efficiency of energy transfer in electrical appliances.


  True
• The efficiency of an appliance is expressed as a percentage


  True
• Higher efficiency reduces energy waste and costs


  True
• In electrical appliances, energy is typically converted from electrical energy into other forms like heat, light, sound, or kinetic energy
• In electrical appliances, energy is typically converted from electrical energy into heat, light, sound, or kinetic energy
• Energy transformation in appliances involves converting electrical energy into heat, light, kinetic energy, sound, or microwave radiation
• Power in electrical appliances is calculated as Voltage x Current
• What type of energy does a kettle use to heat water?

  Electrical energy
• An electric motor uses electrical energy to rotate a shaft
• What is power defined as in physics?

  Rate of energy transfer
• Current is the flow of electric charge and is measured in amperes (A).


  True
• Time in energy calculations is measured in seconds.


  True
• Efficiency is calculated as the ratio of useful energy output to total energy input.


  True
• An incandescent bulb is 5-10% efficient.


  True
• In a kettle, electrical energy is converted into heat
• Match the appliance with its energy input and output:

  Kettle ↔️ Electrical to Heat

  Light bulb ↔️ Electrical to Heat and Light

  Electric Motor ↔️ Electrical to Kinetic Energy

  Microwave Oven ↔️ Electrical to Heat and Radiation
• Which appliance converts electrical energy into light and heat?

  Light bulb
• Which appliance converts electrical energy into sound?

  Loudspeaker
• In electrical appliances, energy is typically converted from electrical energy into forms like heat, light, sound, or kinetic energy.
• A microwave oven uses electrical energy to generate heat and microwave radiation.
• A light bulb converts electrical energy into light and heat.

  True
• What is energy transformation in electrical appliances?

  Electrical to other energy