6.1.1 Energy Changes in a system, and the ways energy stored before and after such changes (Green Topic)

Question 1

What is elastic potential energy?

Answer 1

When we stretch a spring we’re applying a force to change the length of the spring.

We’re putting energy in to stretch the spring. The stretched spring is stirring this energy ans we call that elastic potential energy.

Question 2

What objects are powered by electrical energy but are transferred to thermal energy?

Answer 2

Iron and kettle

Question 3

What 2 objects are powered by electrical energy but are transferred to kinetic energy?

Answer 3

Blender and fan

Question 4

What 2 objects are powered by electric energy but transferred to kinetic energy and thermal energy?

Answer 4

Washing machienes and hairdryers

Question 5

Define power?

Answer 5

The rate at which energy is transferred.

Question 6

Usually which devices have higher power ratings?

Answer 6

Thermal energy devices

Question 7

What is gravitational potential energy?

Answer 7

It is the energy stored in an object due to it’s place above earth. This is due to gravity.

Question 8

Symbols im the power equation?

Answer 8

Power=W, Energy transferred= J, Time=S

Power=W, Work done= J, Time=S