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Is Mr Firth more powerful than a light bulb?
What is Power? Power is measured in watts (W) and tells you how much energy a device can transfer in one second. Naomi
Mr Firth Can lift a dumbell in 0.5 seconds, this gives the dumbell 150 J of gravitational potential energy. What is his power? Power (W) = Energy transferred (J) / Time (s)
Light Bulb Can transfer 5000J of electrical energy into light energy in 25 seconds. What is it’s power? Power (W) = Energy transferred (J) / Time (s)
Power Calculations Complete summary questions
Power is a measure of how quickly energy is transferred. The unit of power is the watt, W. The more energy that is transferred in a certain time, the greater.
Conserving Energy. Questions to Start What does it mean to “conserve” energy? Why do you think it is important to conserve energy? What kinds of things.
P1.3 Electrical Energy. Power Power (watts) = Energy Transferred (joules) Time (seconds) This means the more powerful something is, the more energy is.
Introduction to Power Integrated Science Unit 2: Energy & the Atmosphere.
IN TEXT CHAPTER Power and work and efficiency.
Some might: Compare efficient and inefficient devices Some might: Compare efficient and inefficient devices ENERGY EFFICIENCY most should : Apply the conservation.
The rate at which work is done.
Energy Transfer Diagrams Starter Activity (back of jotters): 1)What are the 10 types of energy? 2)Draw an energy flow diagram for an ipod.
Objectives Recap the different types of energy and energy transformations. Outcomes C: Describe different types of energy. B: Explain energy transformations.
Efficiency Ashfield Direct Learning Verity Payne Ks4 Energy.
Energy Conversion Exploring Energy. What Did We Learn Last Time ? Motion energy is called ___________________ energy It depends on the ________ and _______.
Chapter 13 Energy and Work Section 4 Power. Power Power is the rate at which work is done or the amount of work done in a unit of time. Power is the rate.
TYPES OF ENERGY J. The energy an object has because it is moving. Vibrating objects are sources for this energy. Forms of energy that are waiting to be.
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.
Power The rate at which work is done. Objective: To define and apply the concepts of power and mechanical efficiency.
Wasted energy Not all energy is changed into the type we want.
Energy Transformation *Going from one energy to another.
Measuring Electricity. Electric Potential – the electrical energy that an electron possesses. Electric current is a measure of the rate at which the electric.
Electrical Power & Efficiency. I will be able to calculate cost to operate and percent efficiency of various devices.
Lecture Seventeen Physics 100 Fall 2012 Electric Power and Energy.
Conservation of Energy Notes. Learning Targets I can state the law of conservation of energy I can define the two categories of energy I can determine.
Electric Potential Potential Energy GAS Chemical Potential Gravitational Potential Elastic Potential Energy.
Calculate the missing quantities for the circuit below. V1 = 7.5 V R1 = 5.0 R2 = 3.0 V1 = 40 V R1 = 2.0 V2 = 40 V.
Electric Power Chapter 17 Lesson 4 p Source of Current: Potential Difference If no potential difference: - Free electrons in a conductor move randomly.
Energy Transfer Sound energy Heat energy Chemical energyLight energy Gravitational potential energy Electrical energyKinetic energy Key wordPronunciationDefinition.
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.
1. Complete the following circuit diagram to show the two light bulbs in parallel to each other, connected to the 12 V battery. 2. Marty placed a voltmeter.
To “Kill-a-watt” By: M How much energy do we consume?
6.4 Electrical Power and Potential Difference. Can you match these quantities to their units? CurrentOhms ResistanceCoulombs PowerAmps VoltageWatts ChargeVolts.
Chapter 5 Section 1: What is Energy?
Electrical Potential (Voltage) Answers (Page 303)
Power and Energy Calculations. Power Ratings Power is the rate that an electrical device converts electrical energy into another form (ex. light or heat)
Measuring Electrical Energy Energy: -the ability to do work Electrical Energy: - energy transferred to an electrical load by moving electric charges.
Work and Power Chapter 5!! The End of the ROAD is near…..!!
Some might: Compare efficient and inefficient devices Some might: Compare efficient and inefficient devices ENERGY EFFICIENCY most should : Apply the.
Electrical Calculations. Ohm’s law describes the relationship between current, resistance, and voltage. As voltage increase, current increases As resistance.
ENERGY! And Energy Transmission. Lets first review Work Work = Force (N) x Distance In every simple machine that we have seen, when someone does work.
Lecture Eighteen Physics 100 Fall 2012 Conservation of Energy.
+ V (Volt) = W (work done, J) Q (charge, C)
Current Electricity Current, Power and Energy. Current Electricity Current Electricity is what you get when you plug something into the wall. There are.
What Is Energy? Ch. 8 Lesson 1. How Are Energy, Work, and Power Related?
© Oxford University Press 2011 IP Energy transfers Energy transfers.
© Boardworks Ltd of 7. © Boardworks Ltd of 7 This is an excerpt from the “What is Energy” presentation in Boardworks Science for Australia,
Energy transfers. What is a useful energy transfer? Many household objects are designed to transfer energy from one form into another useful form. What.
Electricity Review Jeopardy. These charges repel.
4.2.3B Electrical Power What About Watts?. Power Law Moving electrons (current) requires ENERGY How much energy gets used depends on: Strength of push.
What is Electricity? Electricity is the flow of moving electrons. When the electrons flow it is called an electrical current.
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.
Electrical power. What is electrical power? Electrical power is the rate at which an electrical appliance uses electrical energy. All appliances have.
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