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.

Draw a line under last lesson’s work and write today’s title in your book... 12/11/2018 c/w Current Electricity P2.3

Engage – Draw and name Pencil and ruler!!!

What is the same about static ELECTRICITY and current ELECTRICITY? What is the different about STATIC electricity and CURRENT electricity?

What do you know about electric circuits?

Current is how quickly electrons flow Current is how quickly electrons flow. We also call this the rate of flow of charge. Current from a battery flows in one direction…this is called direct current. Remember each electron is a bit of charge. Key Notes

Explain We can work out the total amount of charge that has travelled by doing a calculation… Charge = Current x Time Units Charge is in Coulombs, C Current is in Amps, A Time is in seconds, s You need to be able to RECALL (memorise) and USE this equation. Key Notes

INITIAL The rate of flow of charge. In metals it is the flow of electrons. What is the definition of electric current? INITIAL What is the equation to calculate charge? Charge (coulomb, C) = current (ampere,A) x time (second,s) Q = I x t 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!

Explain Example 1 If the current in a bulb is 3A and it is run for 20s, how much charge is transferred?

Explain Example 2 How long does it take for a total charge of 48C to be transferred by a current of 12A?

Now complete the questions

Answers CHARGE = CURRENT x TIME Basic Questions   1. If a current of 7 amps flows for 12 seconds, how much charge has flowed through the circuit? Q = I x t = 7 x 12 = 84C  2. How much charge does a current of 300A transfer in 45s? Q = 300 x 45 = 13500C

Rearrange 3. If a circuit has a charge of 49C and it has flown for 7 seconds, what is the current? I = Q/t = 49 / 7 = 7amps 4. If a circuit flows for 25 seconds and has a charge of 250C, what is its current? I = 250 / 25 = 10 amps 5. How long does it take for a charge of 500C to be created by a current of 25A? t = Q / I = 500 / 25 = 20s 6. How long does it a take a current of 6A to delivery a charge of 6C? t = 6 / 6 = 1s

Convert the units  7. What charge does a current of 30mA transfer in 2 minutes? 1000mA = 1A 1 minute = 60s Q = I x t = 0.03 x 120 = 3.6C 8. What size current transfers 6kC in 10 minutes? 1kC = 1000C I = Q / t = 6000 / 600 = 10A 9. How long does it take (in minutes) for a 10A current to transfer 3.6kC of charge? t = Q / I = 3600 / 10 = 360s  

Current Electricity II Draw a line under last lesson’s work and write today’s title in your book... 12/11/2018 c/w Current Electricity II P2.3

Quick Quiz Back of books 10 1 2 3 11 4 5 6 12 7 8 9

FLASH BACK – LAST LESSON We can work out the total amount of charge that has travelled by doing a calculation… Charge = Current x Time Units Charge is in Coulombs, C Current is in Amps, A Time is in seconds, s You need to be able to RECALL (memorise) and USE this equation. Key Notes

Explore A series circuit is one where the components are one after the other, on one loop A parallel circuit has junctions which cause the circuit to split into different branches Key Notes

How do we connect voltmeters and ammeters? Voltmeters must be connected in parallel around the component Ammeters must be connected in series You will now have the opportunity to use ammeters and voltmeters. Try and observe the changes in voltage and current as you alter the circuits.

A Volt is a joule per coulomb Potential difference (voltage) is the energy transferred per unit passed. A Volt is a joule per coulomb Key Notes

Energy = Charge x Potential Difference Explain We can work out the total amount of energy transferred using the following equation Energy = Charge x Potential Difference Units Charge is in Coulombs, C Energy is joules, j Potential difference (voltage) is in volts, V You need to be able to RECALL (memorise) and USE this equation. Key Notes

INITIAL The energy transferred per unit of charge.. Joule/coulomb What is the definition of potential difference? INITIAL What is the equation to energy? Energy (joule, J) = charge (coulomb,C) x Potential difference (voltage, v) E = C x V 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!

Calculations to be completed in exercise book Basic calculations Calculate the energy transferred across a component with a potential difference of 2V and a charge of 3C. Calculate the energy transferred across a bulb with a potential difference of 5 volts and a charge of 2C Calculate the energy transferred across a bulb with potential difference of 0.5V and a charge of 10 coulombs. Tougher - Rearrange 4. Calculate the potential difference across a motor when 100 joules of energy are transferred for every 5 coulombs. 5. Calculate the charge in coulombs when 320 joules of energy are transferred and the potential difference is 6.5V. 6. Calculate the voltage across a bulb when 425 joules of energy are transferred for every 5 coulombs of charge.

Challenge – Rearrange and convert units 7 Challenge – Rearrange and convert units 7. Calculate the potential difference across a motor when 15 kJ of energy are transferred for every 5C. 8. Calculate the charge in coulombs when 320,000 kj of energy are transferred and the potential difference is 6.5mV. 9. Calculate the voltage across a bulb when 425 joules of energy are transferred in a device that has been on for 45 seconds with a current of 200A passing through.

Answers 1. 2. 3. 4. 5. 6. 7. 8. 9.

To finish with… True or false – re-write and correct the false statements Current is the amount of energy transferred for every unit of charge. Potential difference is the same as voltage Potential difference is the amount of energy transferred per unit of charge Current is measure in coulombs Potential difference is measured in volts. The equation for calculating Energy is E = C X V

Cover Work for Period 6 Work through Exam questions in silence. There are 10 mark schemes available to use once you have completed the questions. Work through, try and avoid using textbooks and/or revision guides.