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Electrical Power The rate at which electrical energy is converted to another form of energy. Thermal, Light, Motion…
Electrical Power Power = current x voltage P = I x V The units for power: watts (W)
Electrical Power All appliances have a power rating to tell how much power it uses. [http://www.nationalwholesaletools.com/index.asp?PageAction=VIEWPROD&ProdID=357]
Standard Voltage in the US is 120 V: [http://www.northpower.com.au/wrs/res2.nsf/images/appliances/$file/Appliance2.jpg] P = 240 W P = 2.0 A x 120 V
Electrical Energy The amount of power that is used over a given time. Energy = Power x Time
Electrical Energy Electric companies normally use the kilowatt-hour to charge for energy. Remember: 1 kilowatt is 1000 watts!
MN is about 12 cents/kWh (When Taxes are Included)
[http://www.think-energy.net/_85256A F_li_meter3a__file_meter3a.jpg] = $82.56 x $0.12 per kWh 688 kWh used May 1st May 31st
Electrical Energy Example: How much does it cost to run an XBOX 360 (160 W) for 3 hours a day for an entire month? 30 days x 3 hours = 90 hours
Electrical Energy Energy = 160 W x 90 h Energy = Wh or 14.4 kWh Each kWh in MN is 11 cents so… 14.4 kWh x $0.11 = $1.58 per month Click Here for Xcel Energy Calculators
Average % of Energy Usage in a Home
[http://media.popularmechanics.com/images/tb_fllightbulb_sm.jpg] [http://www.conservastore.com/productimages/ B.jpg]
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.
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?
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.
The rate at which electrical energy is moved through a circuit is given in terms of power. The unit for electric power is the Watt (W) Electrical energy.
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Electric Power, AC, and DC Electricity Key Question: How much does electricity cost and what do you pay for? *Students read Section 20.3 AFTER Investigation.
Energy Consumption Energy consumption is measured in kilowatt. hours. A kilowatt hour is the amount of energy being consumed per hour. –Energy (kwh) =
Buying Energy20 Apr Class listSeating Plan Buying the POWER!!!! 20 Apr 2012.
Bellringer Two AA batteries in series will provide a voltage of how many volts?
Electrical power pg. 49. Objectives Use the equation for electrical power to solve circuit problems. Understand basic concepts for home electricity usage.
Power and Energy. Power Power means work over a time period Units = Watts Electric power is measured in Watts.
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Do Now (10/10/13): What do Watts measure? Where do you see labels in Watts?
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Rate at which energy is consumed or produced Changed into other forms of energy Measured in WATTS (W)
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Warm-up Activity Think about your experience with the PhET circuit simulation that you recently completed Record in your notebook: –Two things that you.
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Electrical power. Objectives Use the equation for electrical power to solve circuit problems. Understand basic concepts for home electricity usage and.
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Current Electricity Current, Power and Energy. Current Electricity Current Electricity is what you get when you plug something into the wall. There are.
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Electrical Circuits Section 7.3. Electrical Circuits Circuits rely on generators at power plants to produce a voltage difference across the outlet, causing.
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.
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.
34 Electric Current Electric power is equal to the product of current and voltage Electric Power.
Electrical Energy Use in the Home In an electric meter in your home, the electrical energy is measured in kilowatt hours (kW x h).
Buying electricity. Calculating the units of electricity The amount of electrical energy (i.e. the amount of electricity) used by an appliance depends.
Electricity & Safety in the Home. Electrical Devices Electrical devices in the home are grouped into 4 different categories 1) Light-producing (i.e. lamps.
CT108 – Energy Audit Assignment. Top Down And Bottom Up Approach The Top Down Approach The “top down” approach assesses the total energy inputs which.
Chapter 7, Section 3 Notes ELECTRICITY: Electrical Energy (Circuits)
Paying for Electricity. Measuring Electrical Energy The electrical energy that you use at home is measured in kilowatt hours (kW h) The images above.
Circuits & Electronics. Ohm’s Law When you connect a conductor (wire) and a device (light bulb) to the + and – terminals on a battery an electrical current.
Connect the appliance to the power rating using an arrow! Appliance Kettle Iron Television Hair dryer Power rating (W) 1100W 65W 1800W 2000W.
12.2 Using Electrical Energy Wisely (Pages ) Key Concepts: (Page 500)
DC & AC. Direct Current (DC) A flow of charge that flows in one direction, even if the current moves in unsteady pulses A battery produces direct current.
Calculating Energy Use and Converting Units Chapter 2.
Measuring Electrical Energy Energy: -the ability to do work Electrical Energy: - energy transferred to an electrical load by moving electric charges.
Power. Definition: The amount of energy converted to heat, light, sound or motion per unit of time Unit: Power is measured in watts (W) Naming: Named.
ELECTRICAL SYSTEMS Chapter Twenty One: Electrical Systems 21.1 Series Circuits 21.2 Parallel Circuits 21.3 Electrical Power.
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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:
Electrical Energy. Electrical energy is the energy transferred to an electrical device by moving electrical charges. The energy used at home is measured.
Energy & Power for APES Adapted from Maureen Goble.
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.
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