Listen again and complete the sentences below.

1. In a ____________ circuit, if one element burns out and the rest of the circuit keeps working, this is a strong ____________ that the circuit is wired in parallel.

2. If you look at the inner-workings of the ____________, you will see several major ____________.

3. The two metal supports hold the ____________ and connect it to the base where the electrical contact is made.

4. The thin wire has higher ____________ than the filament, so little ____________ flows through it normally.

5. If more than a ____________ of filaments burn out, the higher resistance causes the light string to fail. 6. Each ____________ bulb draws ____________volts and your home electricity is 120 volts.

7. Circuits of 50 bulbs are ____________ in series.

8. If you ____________ a string of 20 bulbs, then those are not 2.5 ____________ bulbs.

9. There is a special bulb that can be put into a strong that will make the string of lights ____________. 10. When it ____________, it no longer touches the support and breaks the circuit.

Speaking

Look at each circuit diagram below.
a) Do you think the bulb(s) will light? If you do, put a tick in BOX A under the diagram. If not, put a cross.
b) Now make the circuit using the equipment. Does the bulb light? If it does, put a tick in BOX B. If not, put a cross.
c) Repeat this for all of the circuit diagrams. Then compare your predictions (BOX A) to your results (BOX B) and share your findings with a partner.

Box A	Box B	Box A	Box B	Box A	Box B
Box A	Box B	Box A	Box B	Box A	Box B
Box A	Box B	Box A	Box B	Box A	Box B

Writing

You need to design a system where one switch can turn on multiple lights.

A) Construct both a series circuit and a parallel circuit using the batteries, Series circuit

wires and bulbs provided to you. Your series circuit will look

something like the drawing on the right:

B) Draw your own diagram below that illustrates how Parallel Circuit

Will look.

Fill in the table for every battery you discovered.

What device?	What size?	What Voltage?	Single Use or Rechargeable	Picture
Flashlight	D	1.5 Volts	Single use

Grammar practice

Дата добавления: 2015-10-29