Energy and Power.

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Presentation transcript:

Energy and Power

Energy Energy: the ability to do work What is energy? Energy: the ability to do work all appliances need energy to work ex. a hair dryer needs to be plugged in to get energy to work ex. a remote control needs energy from batteries to work

Power What is power? Power: the rate at which energy is used or the amount of work done per second is the product of potential difference (voltage) & current intensity

Symbols and Units POWER ENERGY E P Watts Joules Symbol = Units =

FORMULA P = E/t Time Seconds (s) Power Watts (W) Energy Joules (J)

Example #1 A stereo has a power rating of 200W & is used for 1800 seconds. How much energy is used? E = P•t E = (200)•(1800) E = 360,000 J 360,000 Joules of energy were used to work the stereo

Example #2 A video game has a power rating of 175W & is used for 3600 seconds. How much energy is used? E = P•t E = (175)•(3600) E = 630,000 J 630,000 Joules of energy were used to work the video game

Example #3 A hair dryer has a power rating of 425W & is used for 10 minutes. How much energy is used? E = P•t E = (425)•(600) E = 255,000 J 255,000 Joules of energy were used to work the hair dryer

Kilowatt Hours Energy is commonly measured in Joules (J), but can also be measured in kilowatt hours (KWh). 1 kWh = 3 600 000 J KWh is used by Hydro Quebec to calculate your energy bill

FORMULA V = P/I Current Amps (A) Voltage Volts (V) Power Watts (W)

Example #1 A toaster requires 120V & 6A to work. What is its power? P = V•I P = (120)•(6) P = 720 W The toaster has 720 watts of power

Example #2 An appliance requires 240V & 2A to work. What is its power? P = V•I P = (240)•(2) P = 480 W The appliance has a power of 480 watts

Example #3 2nd- Solve Energy 1st - Solve Power E = P•t P = V•I An appliance requires 120V & 12A to work. It is used for 900 seconds. How much energy is used? 2nd- Solve Energy 1st - Solve Power E = P•t P = V•I P = (120)•(12) E =(1440)•(900) P = 1440 W E =1,296,000 J

Example #4 2nd- Solve Energy 1st - Solve Power E = P•t P = V•I An appliance uses 225V & 4A to work. It is used for 60 minutes. How much energy is used? 2nd- Solve Energy 1st - Solve Power 60min x 60 E = P•t P = V•I P = (225)•(4) E =(900)•(3600) P = 900 W E =3,240,000 J

Challenging question A circuit has a resistance of 5Ω. If the battery powering the circuit has a voltage of 10V, how much power is used to run this circuit? R=V/I I= q/t V=E/q P=E/t V=P/I R = 5Ω V = 10 V P= ? I = ? Step 1 R=V/I 5 = 10 / I 5 I = 10 I = 10/5 I = 2 A Step 2 V=P/I 10 = P/2 10 * 2 = P P = 20 watts