What are two transistors like this together called?

• A transistor couple

• A Darlington pair

• A useful pair

• Booster transistors

A circuit diagram shows how the ---------- in the circuit are connected.

The phototransistor detects what?

• Resistance

• Current

• Power

• light

What is this?

• A transistor

• A power source

• A 555 IC

• Something to tread on

The missing component

• Transistor

• Phototransistor

• LED

• Resistor

A 220 Ohm resistor is?

• brown - yellow - blue

• black - black - red

• blue - blue - black

• red - red - brown

Which way did the phototransistor have to be placed?

• Flat side to output

• Flat side to power

• It didn't matter

• Flat side to the side

This is a

• Circuit diagram

• Block diagram

• Schematic

• Data sheet

Which piece of equipment is this?

• Stabilised power supply

• Oscilloscope

• Battery

• Charger

The component the arrow is pointing to is a?

• Phototransistor

• LED

• Bulb

• Infrared LED