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WORK, ENERGY & POWER

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Energy  Energy is the ability to do work  Units: Joules (J)  Energy is the ability to do work  Units: Joules (J)

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Page 1: WORK, ENERGY & POWER. Work A measure of the amount of energy transformed from one form to another For example, work is done when energy is used to

WORK, ENERGY & POWER

Page 2: WORK, ENERGY & POWER. Work A measure of the amount of energy transformed from one form to another For example, work is done when energy is used to

Work

A measure of the amount of energy transformed from one form to another

For example, work is done when energy is used to move something or produce heat or light

Units: Joules (J)

Page 3: WORK, ENERGY & POWER. Work A measure of the amount of energy transformed from one form to another For example, work is done when energy is used to

Energy

Energy is the ability to do work

Units: Joules (J)

Page 4: WORK, ENERGY & POWER. Work A measure of the amount of energy transformed from one form to another For example, work is done when energy is used to

Potential Energy

Stored energy

Examples: Gravitational Elastic chemical

Page 5: WORK, ENERGY & POWER. Work A measure of the amount of energy transformed from one form to another For example, work is done when energy is used to

Kinetic Energy

Energy of objects in motion Heat and light are forms of kinetic

energy

Page 6: WORK, ENERGY & POWER. Work A measure of the amount of energy transformed from one form to another For example, work is done when energy is used to

Electrical Energy

Electrical energy can be transformed into many other kinds of energy

Examples: heat, light, sound, mechanical energy

Page 7: WORK, ENERGY & POWER. Work A measure of the amount of energy transformed from one form to another For example, work is done when energy is used to

Power

The rate at which work is done (more work in less time = more power)

Units: Watts (W) or kilowatts (kW)

Page 8: WORK, ENERGY & POWER. Work A measure of the amount of energy transformed from one form to another For example, work is done when energy is used to

Formulas

P = power (W) E = Energy (J) T = time (s) V = volts (V) I = current (A)

€

P =VI

€

P = Et

Page 9: WORK, ENERGY & POWER. Work A measure of the amount of energy transformed from one form to another For example, work is done when energy is used to

Sample Problems p. 340

1. P =

P =

= 686 W€

Et

€

24000J35s

Page 10: WORK, ENERGY & POWER. Work A measure of the amount of energy transformed from one form to another For example, work is done when energy is used to

2.

E = Pt= 45 W x (28 x 60)s= 75 600 J

€

Page 11: WORK, ENERGY & POWER. Work A measure of the amount of energy transformed from one form to another For example, work is done when energy is used to

4.P = VI = 0.42 V x 1.8 A = 0.76 W

Page 12: WORK, ENERGY & POWER. Work A measure of the amount of energy transformed from one form to another For example, work is done when energy is used to

5. V =

=

= 14.2 V€

PI

€

37W2.6A


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