Chapter 3 Energy Transfer and Conservation

• The temperature of the coffee in each cup is different.

• The temperature of the coffee in each cup is the same.

• The heat in the coffee in each cup is different.

• The heat in the coffee in each cup is the same.

• The temperature of the soup in each bowl is different.

• The temperature of the soup in each bowl is the same.

• The heat in the soup in each bowl is different.

• The heat in the soup in each bowl is the same.

The unit for temperature is _____

The unit for heat is ____

Which of these will happen when energy is conserved? Choose ONE answer.

• The quantity of energy will increase.

• The quantity of energy will stay the same.

• A quantity of energy can be made.

• A quantity of energy can be destroyed.

Which of these shows conservation of energy in an electric lamp? Choose ONE answer.

• Energy input to the lamp equals energy output of the lamp.

• Energy input to the lamp is greater than energy output from the lamp.

• Energy input to the lamp is less than energy output from the lamp.

• The lamp should be switched off when not being in use.

100J of electrical energy is supplied to a motor. The electrical energy is changed to thermal and kinetic energy in the motor. Write down the total quantity of thermal and kinetic energy changed in the motor.

A car engine changes chemical energy to thermal and kinetic energy. A total of 3500J of thermal and kinetic energy are changed. Write down the quantity of chemical energy changed in the engine.

An electrical lamp takes in 1000J of electrical energy. The lamp wastes 850J of energy. Calculate the quantity of useful energy changed by the lamp.

A motorcycle engine uses 2400J of chemical energy in fuel. The thermal energy changed is 1000J. The sound energy changed is 600J. The remaining energy is changed to kinetic for movement. Calculate the quantity of kinetic energy changed by the engine.