2 Link each pair of events to make one complex sentence. Use the clue in brackets to help you.

1 A millimeter is a device. It measures very small currents. (relative clause)

2 A residual current device trips. An excess current passes trough a circuit. (time)

3 Light strikers the solar cell. This generates a voltage. (relative clause)

4 An electrolytic capacitor is connected wrongly. The capacitor will be damaged.(condition)

5 You touch memory chips. Make sure you are earthed.(time)

6 D-type connectors come in a variety of sizes. D-type connectors are widely used for linking devices to computers.(relative clause)

7 A relay is an electro-mechanical switch. It uses an electromagnet.(relative clause)

8 The input signal to an inverter is 1. The output signal will be 0. (condition)

9 A signal is detected. It is amplified.(time)

10 A logic probe is a test instrument. It provides an easy way of checking simple logic circuit.(relative clause)

It is my job

1 Answer the questions.

1 What subjects do you think are included in an Electronics course?

2 What sort of work can an Electronics Technician do?

3 What is the link between lighthouses and electronic?

2 Listen to the interview with Brian Jones, an Electronics Technician. Answer the questions.

1 How did he become interested in electronics?

2. Why did he like the lab work at college?

3 Why did he give up his repair business?

4 What is the Marine GDPS and why is it important?

5 Why does he visit remote places?

6 Why is he not thinking of changing job?

3 Listen to the interviewer again. Write down the interviewer’s questions.

4 Work in pairs. Compare you version of the interviewer’s questions. Role-play the interview.

5 Listen again to compare your version of the interview with the recording.

Gadget box

Printable batteries, thinner than paper, are being developed by a number of companies. They are flexible, cheap, and rechargeable and range in thickness from 0,6 mm to 300 microns, the thickness of a human hair. They can be used for talking greeting cards, RFID( Radio Frequency Identification) tags and many other applications. What other applications are there for printable batteries?

Pronunciation

Reading component values

1 Identify these components.

2 Listen to the recording and note the values.

3 Practise saying the component values aloud.

4 Listen again and compare your pronunciation to the recording.

Problem-solving

1 Work in groups, A and B. Study one of these circuits, A or B. Decide what the circuit is for and prepare a detailed explanation of how it works.

2 Work in pairs with someone from the other group and explain to them how your circuit works. Be prepared to answer any questions your partner may have.

3 Complete the explanations of circuits A and B using the words below. You will not need to use all the words.

Activates	Current	Probes
Battery	Diode	Relay
Bell	Emitter	Resistor
Buzzer	Falls	Rises
Capacitor	Flow	Temperature
Chip	If	Thermistor
Circuit	Light	Transistor
Collector	Off	Value
Conduct	On	Sound
Contacts	Open	Switch

A

This is a thermostat to control the operation of a central-heating system. The __________1 changes in resistance with the ___________2 in the room. This alters the voltage in the base-emitter ______________3, turning the transistor _______________4 if the temperature falls below a preset ________________5. This allows a ___________6 to flow in the ___________________7- emitter circuit which __________8 the relay, closing its __________9 and switching on the system. If the temperature of the ____________10 above the pre-set value, the thermistor will _____________11 the transistor and the heating system ____________12 in the same way.

B

This is a device to detect moisture. The components are: npn junction _________1,

light - emitting _____________2 ,2.2k______________3 , a buzzer, two probes, and a 9-volt _____________4 . No current flows in the base-emitter circuit when there is air between the two ____________5 , so the transistor is turned off__________6 the probes are placed on a damp surface, the moisture will ____________7 . A current will___________8 to the base, turning the transistor on. Current then flows from the battery to the __________9 – emitting diode and the _________10 , giving both visible and audible warning.