L 1 Circuit symbols L 11 National Grid

L 1 Circuit symbols L 11 National Grid L 2 Current & charge L 3 Potential difference L 4 Resistance & Ohm’s Law L 5 Power & energy L 6 Electrical power L 7 Current in series & parallel L 8 Potential difference in series & parallel L 9 Sensing circuits L 10 Three pin plug Pupils should have been taught to: • Specification Students know the definition of potential difference & the difference between series and parallel circuits. Prior Learning Lesson Sequence Pupils will be taught: • The ideas taught in this lesson will expanded upon in the lesson on sensing circuits. Future Learning

Potential difference in series & parallel Do Now Sci. Doc Last Lesson Last Term Last Year Stretch & Challenge I do We do You do Test

Sci. Doc Learning Objectives Recall that voltage is shared across components in a series circuit. Recall that voltage is equal in each path of a parallel circuit. Keywords Voltage Potential Difference Series Parallel Calculate voltage in series and parallel circuits. Do Now I do We do You do Test

In a series circuit, the voltage supplied by the battery is shared by the components. So, the sum of the potential difference across the components equals the battery voltage. Sci. Doc Stretch Both of the lamps above have a resistance of 12 Ω. Calculate the current in the circuit. LO: I do We do You do Test

In a parallel circuit, the potential difference across each bulb is the same as the potential difference across the battery. Stretch: The current flowing through the battery is 0. 2 A. Calculate the resistance of each of the bulbs. This means that all the bulbs have the same brightness, and they are brighter than the same number of bulbs in a series circuit. However, this also means that the battery will run down faster in a parallel circuit. LO: I do Sci. Doc We do You do Test

Example question. What is the potential difference across each of these resistors? Sci. Doc STEP 1: Calculate the total resistance RTOT = R 1 + R 2 = 5 + 10 = 15 Ω STEP 2: Calculate the total current in the circuit I = V ÷ R = 6 ÷ 15 = 0. 4 A STEP 3: Calculate the potential difference across both of the resistors 5 Ohm resistor: V = I × R = 0. 4 × 5 = 2 V 10 Ohm resistor: V = I × R = 0. 4 × 10 = 4 V Note that these potential differences add up to give the total potential difference across the battery (6 V). LO: I do We do You do Test

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Sci. Doc Struggle time! Exam question so exam conditions! You have 6 minutes. LO: I do We do You do Test

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