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Wordwall Learning Objective: To analyse EMF and voltage in circuits

B – Predict variations in PD and EMF in circuits. Wordwall Learning Objective: To analyse EMF and voltage in circuits. A – Predict how resistivity affects EMF. D – Identify circuit symbols. C – Compare EMF and potential difference. Our initial problem?

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Wordwall Learning Objective: To analyse EMF and voltage in circuits

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  1. B – Predict variations in PD and EMF in circuits Wordwall Learning Objective: To analyse EMF and voltage in circuits A – Predict how resistivity affects EMF D – Identify circuit symbols C – Compare EMF and potential difference

  2. Our initial problem? How can this mask mean you never charge your ipod? How would you calculate the EMFof this? Why are we learning this? EMF sums up how powerful ALL electric things are

  3. D – Identify circuit symbols What does this do? Does it have an EMF or a potential difference?

  4. A’s B’s C’s AyshaNayaab Olivia Abdul RohanVineeth ZacRaiyanRohan Waleed Khalid Areeb Umar

  5. A’s : EMF is measured in Volts, or energy per unit charge. If an electron is accelerated across a potential difference of 15V, it hits a nitrogen atom and ionises it. This means it knocks one electron off. What is the energy used in doing so? Why would this change if it knocked off 2 electrons?

  6. B’s : EMF is measured in Volts, or energy per unit charge. Combine this with energy÷ time = power Charge ÷ time = current To show in 5 steps how we get potential difference (V) = power / current If an electron travels across a potential difference of 40V, with enough force to ionise (knock an electron off) another atom, with the knocked off electron giving a current of 1.5A, what is the power?

  7. C’s : EMF is measured in Volts, or energy per unit charge. Use formulas for energy and charge to show in 5 steps how we get potential difference (V) = power / current A torch contains a battery and a bulb in series. The battery has 4.5V EMF and the bulb’s potential difference is 4.2V. How can this be?What is the battery’s energy if current is 0.5A and the torch shines for 1 minute?

  8. (C) Complete the questions (C+) Make up your own question and answer (B-) Predict with reasons howyour answer would change if potential difference doubled? Is that possible? What about if EMF doubled?

  9. Games! Odd one out miniplen #share resources #test @ end of lesson #CREATE RESOURCES for Group work, plus differentiation For A work

  10. Test-time An electron travels across a potential difference of 7.5V. It hits a Magnesium atom and ionises it, by knocking an outer electron off. What is the energy our initial electron had? This takes 2 seconds, what is the current? Why can we work out the power? What is it? Why is this EMF not voltage?

  11. Answers: Energy = voltage x charge = 4.5 x 1.6 x 10-19 Current = charge x time = 2 x 4.5 x 1.6 x 10-19 Because power is energy/time, or current x voltage. = 4.5 x 2 x 4.5 x 1.6 x 10-19 Because energy is being transferred it is an EMF!

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