Effects of current

In this challenge you are presented with 10 questions about the effects of current.

Instructions:

For the 10 questions:

• choose the correct answer
• write down your answer.

Note:

• You can print this page and write you answers onto it.

 

1. What is the term used to describe touching a wire that has become live under a fault condition?

1. Direct contact.
2. Indirect contact.
3. Closed contact.
4. Open contact.

 

2. An isolation device or switch should be positioned to interrupt the earthing conductor.

1. True.
2. False.

 

3. What do the letters RCD stand for?

1. Reverse Current Device.
2. Residual Current Direct.
3. Residual Current Device.
4. Resistive Current Device.

 

4. What are RCDs used to protect against?

1. Earth leakage current.
2. High voltage discharge.
3. Active supply isolation.
4. Resistive current direction.

 

5. How does an RCD provide protection?

1. By connecting the circuit to a circuit breaker.
2. By connecting the circuit to a fuse.
3. By interrupting a circuit.
4. By any of the above.

 

6. Which of the following protection devices can be automatically reclosing?

1. A fuse.
2. A circuit breaker.

 

7. How can a fuse be used to protect a circuit?

1. By opening on overcurrent.
2. By closing on overcurrent.
3. By increasing the resistance in a circuit so less current flows.

 

8. Which of the following uses magnetism caused by current flow to operate?

1. Electroplating process.
2. A light globe.
3. A relay.

 

9. Which of the following uses heat caused by current flow to operate?

1. Electroplating process.
2. A light globe.
3. A relay.

 

10. What determines the amount of magnetism created by current flow?

1. The amount of current flow.
2. The heat generated by the current flow.
3. The chemical reaction caused by current flow.
4. All of the above.

 

When you have finished:

• show your answers to your trainer
• close this window and choose a new activity from the menu.