Power and electrical power 12 March 2016 Keywords: Power, Energy, Weight, Force Objectives Understand what power is and be able to calculate it. HSW: AF5.

Slides:

Advertisements

Similar presentations

Work Work is done only when a force moves an object.

Advertisements

Section 1: Work.  Explain the meaning of work.  Describe how work and energy are related.  Calculate work.  Calculate power.

Unit 5-1: Work and Power. Work When we were looking at force, we observed that an objects motion is related to how the force acts and how long it acts.

Electrical Devices 20 April, April, 2017 Objectives

19/08/2015 Current, Charge & Power Objectives To apply equations of power, electrical energy and potential difference to different situations. HSW: AF2.

Power Core • Relate (without calculation) power to work done and time taken, using appropriate examples Supplement • Recall and use the equation P = E/t.

Energy and Work 25 October 2011 Objectives Understand the term Work Done and be able to use the equation. Know that work done against friction results.

Electrical Power Lesson Objectives:

Chapter 8 Section 1: Work and Power

First in come to me Come to me Quick quick... there’s prizes... And pixies... And other nice stuff... Not really but you do get to be in charge of the.

Cost of electricity Objectives Be able to calculate the cost of electrical devices. HSW: AF2: Evaluate the effects of technological developments on society.

POWER Power – Power = P = ___=___ Units = ( ) = ____ = ___ Sample Problem: A crane lifts an 8000 N beam 75 m to the top of a building in 30 s. How much.

Conduction 03 June 2016 Objectives Be able to describe how heat is transferred You will be able to define conduction and describe it in terms of the particles.

Conservation of Energy 04 June 2016 Objectives Be able to describe what the Conservation of Energy is and understand that as energy is transferred it gets.

6.1 – Work. Objectives Explain the meaning of work. Explain the meaning of work. Describe how work and energy are related. Describe how work and energy.

Work and Power. Work Work happens when a force moves an object over a distance Work happens when a force moves an object over a distance If the object.

Power -rate at which work is done or amount of work done in a unit of time -The faster work can be done the more power there is Power = work / time or.

 Work – the product of force and the distance traveled  The unit of Work is a Joule (J)  Work= Force × distance W = F ● d Distance (m) Force (N) Work.

POWER The rate at which work is done The rate at which work is done The amount of work done in a unit of time The amount of work done in a unit of time.

Work and Power. What is force? A force is a push or a pull.

Section 1: Work and Power What is work? Which picture shows work being done? The one where kids are having fun playing basketball or the one where a girl.

Visible Light Objectives Be able to describe how Visible Light is used in photography. HSW: AF2: Evaluate the effects of technological developments on.

Work = Force x Distance W= F x d Work is a force exerted across a distance ! A transfer of energy!

Section 14 Work, Power, and Energy. More Power!!!!! What does he mean?

Calculating Work. Work = force x distance W=f x d Unit of Measurement for Work is Joules Unit of Measurement for Force is Newtons Unit of Measurement.

PHYSICS – Work and Power. LEARNING OBJECTIVES Work Core Demonstrate understanding that work done = energy transferred Relate (without calculation)

Aim: How can we apply work- energy to motion problems? Do Now: In your own words, what does energy mean to you? In your own words, what does energy mean.

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.

Chapter 5: Work and Machines.  Compare the effort exerted by a backpacker moving over level ground to that exerted by a backpacker moving uphill.  How.

Lesson 9 Power of a Motor.

ENERGY EQUATIONS By the end of this presentation you should be able to: Calculate kinetic energy, work and power.

Chapter 6 Work and Machines

To understand how fuses and circuit breakers work.

Be able to describe how the resistance of LDRs and Thermistors varies.

Terminal Velocity Objectives

Be able to describe what resistance is and calculate it.

Work, force, motion, and power

Potential Difference Objectives

Work and Power.

April 20, 2010 Explain why holding a large box is not considered work.

Measuring Energy YEAR 8 PHYSICAL SCIENCE.

Work, Energy and Power.

Power and electrical power

Chapter 7 Work.

Learning Target 3.5 – Be able to describe scientific Work & Power

Starter Round the room TIME TO BEAT 2.12.

Laws of Motion and Energy

What is work Chapter 4 section 1.

Energy, Work & Power How the world works…..

Science 9 Chapter 5: Work and Machines Chapter 6: Thermal Energy

Physical Science Chapter 5

Presentation transcript:

Power and electrical power 12 March 2016 Keywords: Power, Energy, Weight, Force Objectives Understand what power is and be able to calculate it. HSW: AF5 – Working critically with evidence AF4 – Using investigative approaches Used before in: lesson 1 – work Will use again in: PLTS: Team workers – Work collaboratively with others. Used before in: Science AWill use again in:

Outcomes All students should be able to describe what makes an object powerful or not. Most students should be able to define power and use the equation. Some students should be able to evaluate practical work and describe how to make it more valid and reliable.

Powerful cranes Which is the most powerful crane? Explain why.

How is power calculated? The power exerted by an object can be calculated using one of two equations: Time is measured in seconds (s). Power is measured in watts (W). Work done is measured in joules (J). work done time taken power = Remember that work done = energy transferred.

A lawnmower engine does 10 kJ of work in 10 seconds. What is the power of the engine? Calculating power question 1 = 1,000 W = 1 kW power = work done time = 10,000 / 10

A car transfers 12 mJ of energy in 2 minutes. What is the power of the car? Calculating power question 2 = 100,000 W = 100 kW = 12,000,000 / 120 power = work done time = energy transfer time

Power, work and time calculations

Anagrams

And finally – we find out – who are more powerful – boys or girls? Force x distance = energy Energy/time = power Boys:Girls: ForceDist for 1 rep repsTotal dist worktimepowerForceDist for 1 rep repsTotal dist worktimepower Skipping Lifting Push ups Analysis: What conclusion can you draw? Evaluation: was the evidence reliable? Explain.

EnergyGravitationalWatts HeatPowerKinetic Electrical 1 Joule per second Joules

Plenary - Multiple-choice quiz