Review Read the comments I have written in your book.

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Review Read the comments I have written in your book. Complete your next steps in PURPLE PEN. Correct any Spelling and Grammar mistakes in PURPLE PEN.

Learning Objectives

Engage E = I x V x t E Q V Q I t V I R P I V x x x x Recall ALL the equations for this topic and write them in your exercise books or on the white boards. Draw out the formulae triangle for each, give the units and symbols E Q V x E = I x V x t Energy = (there are 2 equations for Energy) Charge = Voltage = Power = Q I t x V I R x P I V x

Draw a line under last lesson’s work and write today’s title in your book... 04/02/2019 c/w Power P2.4

Explore Power is the energy transferred per second. It is measured in watts (W)

Explore Power (watt,W) = Energy transfeerred (joule, J) / time taken (second, s) E P t x P = E / t

Examples Basic Calculate the power of an appliance that transfers 4 joules of energy over 8 seconds. P = E / t = 4 / 8 = 0.5W Rearrange Calculate the time an 400W microwave is on for if it transfers 16000 joules of energy. t = E / P = 16000 / 400 = 40s Unit conversion Calculate the power of an appliance that transfers 800megajoules of energy every 5miliseconds. 800MJ = 800,000,000J P = E / t = 800,000,000 / 0.005 5ms = 0.005s = 1.6 x 10^11W

Your turn - Basic Calculate the power of a television that has 5000 joules transferred every 2.5 seconds. Calculate the power of an iphone that transfers 10,000 joules every 2 seconds. Calculate the power of the school server that has 500,000 joules transferred every 10 seconds.

Rearrange 4. Calculate the energy transfer in microwave that has been switched on for 200 seconds with an 800W power rating. 5. How long would you have to cook a packet of rice for if it requires 10,000 joules of energy in a 500W microwave. 6. How long would you need to be on a mobile for to transfer 20,000 joules of energy if the phone has a power rating of 200W.

Conversions 4. Calculate the energy transfer in a microwave that has been switched on for 2 hours with a 500W power rating. 5. How long would you have to cook a potato for if it requires 100 MJ of energy in a 500W microwave. 6. How long would you need to be on a mobile for to transfer 20,000 joules of energy if the phone has a power rating of 20kW.

Power (watt,W) = Current squared (ampere2,A2) x resistance (ohm, Ω) Explore Power (watt,W) = Current squared (ampere2,A2) x resistance (ohm, Ω) P I2 R x P = I2 x R

Examples Basic Calculate the power of an appliance that has a current of 3A and a resistance of 5 ohms. P = I2 x Ω = 32 x 5 = 9 x 5 = 45W Rearrange Calculate the current passing through a component with a resistance of 4 ohms and a power of 200W. I2 = P / Ω = 200 / 4 = 50 I = 50 = 7.07A

Basic Calculate the power of an appliance that has a current of 5A and a resistance of 10ohms. Calculate the power of a television that has a current of 20A and a resistance of 12ohms. Calculate the power of a radio that has a current of 30A and a resistance of 5ohms.

Rearrange 4. Calculate the current of lamp that has a power rating of 10W and a resistance of 200 ohms. 5. Calculate the current of a radio that has a power rating of 10kW and a resistance of 22ohms. 6. Calculate the resistance of a component in a circuit when the current is 7.5A and the power output is 250W.

7. Calculate the current travelling through a supercomputer that has a power rating of 50MW and a resistance of 200 ohms. 8. Calculate the current of a radio that has a power rating of 15kW and a resistance of 22milli ohms. 9. Calculate the resistance of a component in a circuit when the current is 5mA and the power output is 250mW.

How do we calculate power? INITIAL The energy transferred per second. It is measured in watts. What is the definition of power? INITIAL Power (watts, W) = Energy (joules, J) / time (seconds,s) How do we calculate power? Power (watts, W) = Current (Ampers,A) x Potential Difference (voltage, V) Power (watts, W) = Current squared (Ampere2,A2) x Resistance (ohms, Ω) I am going to collect these back in. I will look after them and you will get them all back to use over the summer holidays and in Year 11!

Exam Question time! Complete the exam questions provided