Electrical Safety and Safe Circuit Assembly

Try these questions

5 questions from this lesson’s quiz. Start the lesson to answer them and see the right answers.

1. 1. A pupil is setting up a circuit using dry cells, wires and a bulb. What should the position of the switch be while the wires are being connected?

   • A. Open
   • B. Closed
   • C. Either position, as dry cells are always safe
   • D. Closed, to test each wire as it is connected

2. 2. How should an ammeter be connected in a circuit to measure the current through a bulb?

   • A. In parallel with the bulb
   • B. In series with the bulb
   • C. Across the dry cell terminals only
   • D. Across the switch only

3. 3. Why must a fuse in a circuit never be replaced with a piece of copper wire or a metal paperclip?

   • A. Copper wire increases the voltage of the supply
   • B. The fuse would no longer change alternating current into direct current
   • C. The wire would not melt during an overload, so the circuit would not break and could start a fire
   • D. Copper wire has too much resistance and would make bulbs dim

4. 4. A school in Nakuru wires its classroom lights in parallel. What is the main advantage of this?

   • A. The lights become dimmer as more bulbs are added
   • B. If one bulb blows, the other bulbs stay on
   • C. Current flows through only one bulb at a time
   • D. The lights use no electrical energy

5. 5. A pupil connects an ammeter in parallel with a lamp. The lamp goes out and the wires become hot. What is this circuit fault called?

   Type your answer in the lesson.

More in Laboratory Safety

• ▸Fire Safety and Emergency Response
• ▸Safe Handling and Operation of the Bunsen Burner
• ▸Safe Handling and Care of Laboratory Glassware and Measuring Apparatus
• ▸Safe Handling and Care of Optical Instruments The Microscope
• ▸Safe Chemical Handling
• ▸Laboratory Safety Showcase
• ▸Introduction to Laboratory Apparatus and Safety
• ▸Heating Apparatus The Bunsen Burner

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