3 e electronics 181110

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Measuring current in a series circuit: S3

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3 e electronics 181110

  1. 1. Electricity 3E: Thursday 18th November
  2. 2. Review our previous learning: hands up please! • Why do we use electrical energy? • What properties of metals allows us to use them to transfer electrical energy? • What forms of energy are given out by the lamp? • What forms of energy would be given out by a television? • Revisiting our model for current flow: • What do electrons pick up from battery? • How many electrons are used up around the circuit? • How could we send more energy to the lamp? • What do these symbols represent:
  3. 3. Measuring current • Current (flow of charge) has symbol I, and is measured in Amperes (A) • We use an Ammeter to measure current through a circuit • Ammeter is connected in line with the other components – in series – We ‘break into’ the circuit:
  4. 4. Aim of experiments • A) We are going to measure the current in the circuit for 1, 2, 3 and 4 bulbs • B) We are going to measure the current at different points within our circuit containing 4 bulbs • Working in pairs: – Collect 3 cells, 4 lamps, 8 wires and 1 Ammeter • Write down your apparatus, circuit diagram, method and results in a table (use a ruler!) in your notebooks
  5. 5. Conclusions • When more bulbs are added to the series circuit the current is reduced • The current is the same at ALL points within the series circuit
  6. 6. Conclusions • When more bulbs are added to the series circuit the current is reduced • The current is the same at ALL points within the series circuit

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