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. 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. 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. 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. 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
