Transcript snc1l u4l10 combination circuits

Combination Circuits
Lesson 10
 A simple electric device, like a flashlight,
may contain just one series or parallel
circuit. However, most of the electric
systems you use at school and at home are
combinations of series circuits and parallel
circuits. This kind of circuit is called a
Combination Circuit.
 In a Combination circuit, the parts of
the circuit that are connected in series
work like a series circuit. The parts that
are connected in parallel work like a
parallel circuit. This means that you can
design a single circuit to meet several
different needs.
 Look at the circuit diagram. Then answer the questions
below.
Switch 1
Bulb 1
Switch 3
Switch 2
Bulb 2
Bulb 3
 If all three bulbs are identical, which bulb or bulbs will burn
the most brightly in this circuit?
 Bulb 3

 What will happen if bulb 1 burns out?
 Bulb 2 will also go out

 What will happen if bulb three burns out?
 Bulbs 1 and 2 will stay on
 Which switch controls only one bulb?
 Switch 3
 Which switch controls two bulbs?
 Switch 2
 Which switch controls all three bulbs at once?
 Switch 1
 Where could you connect an ammeter to measure the
current through the entire circuit? Mark this location on the
circuit diagram.
Switch 1
Bulb 1
Switch 3
Switch 2
Bulb 2
Bulb 3
Building a Combination Circuit
 Task: Build and draw a circuit that contains two batteries in
parallel connected in series to two batteries connected in parallel.
Also include a switch that controls one light, a switch that controls
two lights, and a switch that controls 4 lights.
What to do
 Discuss with your group how you will set up the circuit.
 Draw a labelled diagram of your circuit.
 List the materials that you will need to build your circuit.
 Build and test your circuit
 Improve your circuit until your group is satisfied with the way it
works.