Energy efficiency, energy calculations

The law of conservation of energy states that energy cannot be__________________

• transformed or transferred

• created or destroyed

• used or wasted

• input or output

Input energy is...

• How well a device converts input energy into useful energy

• Energy that is not used for something useful/ something we want

• Energy that is used for something useful

• Energy that goes into a device/ process

Useful energy is...

• How well a device converts input energy into useful energy

• Energy that is not used for something useful/ something we want

• Energy that is used for something useful

• Energy that goes into a device/ process

Wasted energy is...

• How well a device converts input energy into useful energy

• Energy that is not used for something useful/ something we want

• Energy that is used for something useful

• Energy that goes into a device/ process

Energy efficiency is...

• How well a device converts input energy into useful energy

• Energy that is not used for something useful/ something we want

• Energy that is used for something useful

• Energy that goes into a device/ process

The units of energy are...

• Joules

• Grams

• Watts

• %

Energy efficiency should be expressed as....

• Joules

• Grams

• Watts

• %

Power is measured in...

• Joules

• Grams

• Watts

• %

The input energy is....

• heat

• light

• electrical

The wasted energy is....

• heat

• light

• electrical