Section 3.3 Measuring Energy Input and Output 1

Slides:



Advertisements
Similar presentations
Electricity & Safety in the Home
Advertisements

Factors Affecting Resistance
What is included in a circuit diagram?
S Explain parallel circuits, components, and safety of house wiring. S Develop a formula for power consumption and solve related problems.
ELECTRICAL SYSTEMS 21.3.
Electrical Energy Use in the Home
12. 2 Using Electrical Energy Wisely. (Pages )
Electric Circuits Chapter 20.3.
 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.
 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.
Pages  In this PowerPoint, write down everything that is RED!!
To bring electric current into a building, an electrician installs wiring. In a house, all of the wires usually come from one main box.
Using Electrical Formulae Using the formulae you have been taught (V=IR, P=VI, Energy in kWh = kilowatts x hours) first of all work out which formula you.
Understanding Electricity
Electrical Appliances and Power. Learning Objectives To be able to calculate power, and cost of electricity To be able to apply these calculations to.
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.
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
Ohm’s Law and Electrical Power
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.
Paying for Electricity How much does it cost to watch T.V. for 2 hours?
Bellringer Two AA batteries in series will provide a voltage of how many volts?
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.
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.
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.
Chapter 6 Power. Chapter 6.1 Power in Mechanical Systems.
Physical Science Mr. Barry. Series circuits have one loop through which current can flow.
Power and Energy Calculations. Power Ratings Power is the rate that an electrical device converts electrical energy into another form (ex. light or heat)
Electrical Power & Efficiency.  I will be able to calculate cost to operate and percent efficiency of various devices.
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.
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?
Topic 7: Measuring Electric Power. Getting electricity to your home Power generating station  transmission lines  home Step- up transformer Step- down.
Energy Consumption Energy consumption is measured in kilowatt. hours. A kilowatt hour is the amount of energy being consumed per hour. –Energy (kwh) =
Energy Efficiency Unit D – Electrical Principles and Technologies - Concept 3.
Electrical power. What is electrical power? Electrical power is the rate at which an electrical appliance uses electrical energy. All appliances have.
THIS IS With Host... Your Mrs. Coburn OHM’sGot the POWER Can’t Kill a Watt Circuit Efficiency In a Parallel Universe 100.
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.
P1.3 - Revision Energy – Transfer – Power - Efficiency.
Electrical Power and Cost of Electricity
Power and Energy Energy Power
Electrical Systems Series Circuits Parallel Circuits Electrical Power.
Efficiency Hair dryer TV Lamp Toy Radio Heater Answer
The Cost of Electricity
Electric Power Energy Cost
Measuring Electrical Energy
Energy Consumption: HOME.
Energy Transfer & Transformation
Energy Consumption: HOME.
What Is Work? Chapter 12 Section 1.
Electrical Calculations
9.2 The Power of Electricity
Electricity Calculations:
Section 3.3 Measuring Energy Input and Output 1
Power.
Energy Consumption: HOME.
Section 3.3 Measuring Energy Input and Output 1
Goals To calculate resistance using Ohm’s Law
Chapter Twenty One: Electrical Systems
The Cost of Electrical Energy
Energy and Power.
Electric Power.
Power S Define electrical power as energy per unit time, and solve related problems. Include: P = E/t.  
May 6, 2009 In our lab yesterday, what device did we use to measure the current? Voltage? What causes circuits to become overloaded?
Presentation transcript:

Section 3.3 Measuring Energy Input and Output 1

We use energy in every aspect of our life. Driving, ipods, heating our homes, cooking food, watching tv. How can we choose which type of energy to use? (ex: we could use electricity, gasoline, propane, hydrogen) We need to measure the types and amounts of energy going into and coming out of the devices.

Power Power is the rate at which a device converts energy. Unit of power is the watt (W). 1 watt is equal to 1 joule per second 1W = 1J/s Ex: 44 W = 44 J/s The faster a device converts energy, the greater its power rating. Is an appliance with high watts or low watts better? Why?

Is an appliance with high watts or low watts better? Why?

Power formula For an electrical device, the power is the current multiplied by the voltage. P = I x V (watts = amps x volts) P I V

Power Calculation Example A hair dryer has a power rating of 1000 W. It is plugged into a 120-V outlet. What is the current flowing through the hair dryer? Known: Power (P) = 1000 W, Voltage (V) = 120 V Unknown: Current (I) = ? Formula: I = P/V Solve: I = 1000 W/ 120 V I = 8.33A

P t Energy Energy formula E You can use the power rating of a device to determine the amount of energy the device uses (power is the rate at which a device converts energy). Energy formula Energy consumption of an electrical device is its input power multiplied by the time the device is used. E = P x t (joules = watts x seconds) E P t

Energy Calculation Example A microwave oven has a power rating of 800W. If you cook a roast in the oven for 30 min at high, how many joules of electrical energy are converted into heat by the microwave? *Remember that W = J/s Known: P = 800 W (J/s), t = 30 min 30 min = ? s 30min x 60 s/min = 1800s Unknown: E = ? Formula: E = P x t Solve: E = 800 W x 1800s E = 1 440 000 J = 1.4 MJ

Kilowatt Hours It doesn’t take common electrical devices long to consume a large number of joules. Because of this, the kilowatt hour is often used. Energy calculation is the same, except you use hours instead of seconds, and kilowatts instead of watts. 1 kW = 1000 W