Year 8 Revision - Electronics

Which of the following are components of a moisture sensor circuit?

• Resistor

• Transistor

• LED

• Battery

What does a resistor do? Fill in the blank: A resistor ______ the flow of current within a circuit. This protects other components.

• restricts

• increases

• measures

• generates

If the probe detects moisture, what will happen to the LED?

• The LED will light up.

• The LED will blink rapidly.

• The LED will turn off.

• The LED will change color.

Label the parts of the soldering iron and related items in the diagram.

• Tip, Flex, Heating Element, Sponge, Solder

• Handle, Wire, Battery, Switch, LED

• Blade, Motor, Cord, Stand, Oil

• Nozzle, Tube, Pump, Filter, Tray

(e) Health and safety when soldering: Name two important safety precautions. 1) ______ 2) ______

• 1) Don't touch the tip 2) Tie back long hair

• 1) Wear sandals 2) Use wet hands

• 1) Eat while soldering 2) Use plastic tools

• 1) Ignore ventilation 2) Work in the dark

Which of the following is a safety instruction when using an iron?

• Always place the iron on the stand.

• Leave the iron unattended.

• Ignore all incidents.

• Breathe in fumes.

Which type of plastic can be reheated and reshaped?

• Thermosets

• Thermoplastics

• Hardwoods

• Softwoods

Fill in the blank: Thermosets can ___ be reheated or reshaped.

• not

• always

• sometimes

• easily

Which of the following is an example of a thermoplastic?

• Bakelite

• Oak

• Acrylic

• Pine

Which of the following is an example of a thermoset?

• HIPS

• Bakelite

• Mahogany

• Spruce