5.10 Energy and Power  Energy (E) the ability to do work Measured in Joules (J)  Power (P) the amount of work that can be accomplished in a certain amount.

Slides:

Advertisements

Similar presentations

Electricity & Safety in the Home

Advertisements

Factors Affecting Resistance

Quarter 3 Test 2 Review. 1 Typically, household appliances operate at 120 volts. What is the current flowing in the circuit of a microwave when the resistance.

12. 2 Using Electrical Energy Wisely. (Pages )

 Rate at which energy is consumed or produced  Changed into other forms of energy  Measured in WATTS (W)

The rate at which a device converts energy. The unit for power is the “watt” (we also use kilowatt and gigawatt depending upon the size) There are two.

Power and Energy. Power Power means work over a time period Units = Watts Electric power is measured in Watts.

Measuring Electrical Energy Ch. 11. Energy: the ability to do work Electrical Energy: energy transferred to an electrical load by moving electric charges.

Measuring Electrical Energy Lesson 11. Measuring Electrical Energy What is Energy? Energy- The ability to do work Electrical Energy- The energy transferred.

 POWER: the rate of change in energy; also the rate at which work is done or energy is transformed  JOULE (J): the unit for measuring energy  WATT.

Dynamic Electricity: Electric Energy &Power. Electric Power The electric power of a machine is an indication of the amount of work it can do, that is,

Chapter 9.2 Power.

Understanding Electricity

Power. Your Utilization of Electricity Have you ever heard the word Watt before? Have you ever used the word Kilowatt before? When? When a person is speaking.

34.11 Electric Power Electric power is equal to the product of current and voltage.

Chapter 5. Remember from Grade 9…… Work (joules) = Force (newtons) x Distance (metres) Energy is the ability to do work. (also measured in joules) Challenge:

Buying Energy20 Apr Class listSeating Plan Buying the POWER!!!! 20 Apr 2012.

Physics Day 23 Aim: How much power does a toaster use? LO: Calculate power use for V, I and R LO: Calculate energy use from power LO: Kilowatt-hour is.

Current Electricity Current, Power and Energy. Current Electricity Current Electricity is what you get when you plug something into the wall. There are.

Section 3.3 Measuring Energy Input and Output 1 p

Electrical Power, Efficiency, and Consumption 3.1.

19.2 Potential difference (d) define potential difference and the volt. (e) recall and solve problems using:. f) recall and solve problems using: (d) define.

Bellringer Two AA batteries in series will provide a voltage of how many volts?

Jag Mark In terms of electrons, how can an uncharged object become charged?

Electrical Power & Energy Chapter 7-3. Electrical Power F Power is the rate at which work is done F Electrical energy is easily converted into other forms.

Measuring Electrical Energy.  Energy: the ability to do work.  Electrical Energy: energy transferred to an electrical load by moving electric charges.

Measuring Electrical Energy 11.2 & Energy: the ability to do work Electrical Energy: energy transferred to an electrical load by moving electric.

Measuring Electrical Energy Energy: -the ability to do work Electrical Energy: - energy transferred to an electrical load by moving electric charges.

Work, Energy and Power. Work and Energy  Work is defined as the transforming or converting from one form of energy into another form of energy.  Every.

Electrical Power and Energy. Electrical Power We briefly discussed power (P = W/T), where P = power, W = Work, and T = Time – Power was defined as the.

Energy and Cost. 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.

Calculate the missing quantities for the circuit below.

Chapter 6 Power. Chapter 6.1 Power in Mechanical Systems.

Physical Science Mr. Barry. Series circuits have one loop through which current can flow.

Electrical Power & Efficiency.  I will be able to calculate cost to operate and percent efficiency of various devices.

Using Energy Wisely Section Your Hydro (Energy) Bill.

Electric Power Lesson 2.5. Key Concepts How do you calculate electric power? What factors are used to determine how people pay for electrical energy?

Electrical power. What is electrical power? Electrical power is the rate at which an electrical appliance uses electrical energy. All appliances have.

Measuring Energy Input and Output. Power Is the rate at which a device converts energy Unit of power is Watt (W) =which is equal to one joule per second.

Energy & Power for APES Adapted from Maureen Goble.

Energy and Power. Energy The ability to do work. Measured in Joules.

Hosted by Mr. McDevitt Voltage CurrentPower Short Circuit

Chapter 34 Notes Electric Circuits. Electric Current Intro Voltage is an “electric pressure” That can produce a flow of charge, or current, within a conductor.

Power and Energy Energy Power

Electrical Systems Series Circuits Parallel Circuits Electrical Power.

Measuring Electrical Energy

7. Power in electric circuits

Efficiency Hair dryer TV Lamp Toy Radio Heater Answer

Electric Power Energy Cost

Measuring Electrical Energy

Energy Consumption: HOME.

Electrical Power & Energy

Energy and Power for APES

Section 3.3 Measuring Energy Input and Output 1

9.2 The Power of Electricity

Electricity Calculations:

Section 3.3 Measuring Energy Input and Output 1

More electricity stuff

Section 3.3 Measuring Energy Input and Output 1

Energy and Power for APES

The Cost of Electrical Energy

Energy and Power.

Warm up A light needs 3 amps to produce light the resistance of the bulb is 1.5 ohms. How many batteries do you need if each battery is 1.5 volts? What.

Power, Energy and Electrical Safety

Notes 7.3 : Calculating Electric Power + Electrical Energy

Electric Energy Measurement, Units, and cost Your Electric Bill

Hosted by Mrs. McDevitt 

Presentation transcript:

5.10 Energy and Power  Energy (E) the ability to do work Measured in Joules (J)  Power (P) the amount of work that can be accomplished in a certain amount of time Measured in Watts (W)

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 What is energy?

Power the rate at which energy is used or the amount of work done per second Is measured in Watts  A microwave that uses more Watts will heat food faster! What is power?

Symbols and Units Symbol = Units = Symbol = Units =

Power Watts (W) Energy Joules (J) Time Seconds (s) E = P x Δt

A stereo has a power rating of 200W & is used for 1800 seconds. How much energy is used? E = P x Δt = 200 x 1800 E = J

A video game has a power rating of 175W & is used for 3600 seconds. How much energy is used? E = 630,000 J 630,000 Joules of energy were used to work the video game E = P x Δt = 175 x 3600

A hair dryer has a power rating of 425W & is used for 10 minutes. How much energy is used? E = 255,000 J 255,000 Joules of energy were used to work the hair dryer Time must be in seconds 10 min x 60 = 600 seconds E = P x Δt = 425 x 600

How do we pay for the energy we use?  Energy can also be measured in kilowatt hours (kWh). If we use 1000W in 1 hour, we consume 1 kWh = J

KWh is used by Hydro Quebec to calculate your energy bill  For a average summer day. Mrs “I” uses 44 kWhs. 30 kWh x $ = $ kWh x $ = $1.051 $2.647 This is just for ONE day.

P = IV Power Watts (W) Current Amps (A) Voltage Volts (V)

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

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

An appliance requires 120V & 12A to work. It is used for 900 seconds. How much energy is used? Tricky Question

An appliance requires 120V & 12A to work. It is used for 900 seconds. How much energy is used? P = IV P = (12)(120) P = 1440 W Tricky Question E =1,296,000 J E = P x Δt = 1440 x 900

An appliance uses 225V & 4A to work. It is used for 1 hour. How much energy is used? P = IV P = (4)(225) P = 900 W Tricky Question E =3,240,000 J 60min x 60 E = P x Δt = 900 x 3600