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Power

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by

Paul Sheffield

on 26 March 2014

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Transcript of Power

L.O
Calculating electrical power
using and rearranging equations
calculating efficiency

Weight and pulley demo
Calculate electrical power input
Calculate Power output
Calculate efficiency of the motor
KEY FACTS
what is power?
what is the unit?
what is voltage?
what is charge?
what is current?
Test Questions
In the UK mains electricity is a 230 volt a.c. supply.

(a) What is the frequency of the a.c. mains electricity in the UK?

........................................................................................................................

(1)

(b) (i) What is an electric current?

...............................................................................................................

(1)

(ii) Explain the difference between an a.c. (alternating current) electricity supply and a d.c. (direct current) electricity supply.

...............................................................................................................

...............................................................................................................

(2)

(c) A householder has a 10.8 kW electric shower installed in the bathroom.

(i) Calculate the current drawn from the mains electricity supply by the shower.

Write down the equation you use, and then show clearly how you work out your answer.

...........................................................................................................

Current = .................................... A

Power
Full transcript