NT NLC 2018 Project AR Electricity Group 3&7

A vacuum cleaner is labelled "230 V, 1200 W".  Which of the following statements is true?

• The vacuum cleaner uses 230 V of energy.
• The vacuum cleaner has a power of 5.22 A.
• The vacuum cleaner has a working current of 0.192 A.
• The vacuum cleaner uses 1200 J of energy every second.

A hairdryer, when connected to a 220 V supply, takes a current of 11 A. What is the power of the hairdryer?

• 11 W
• 20 W
• 220 W
•  2420 W

What is the SI unit for potential difference?

• joule
• newton
• volt
• watt

Which of the following oppose the flow of the current?

• force
• current
• voltage
• resistance

The diagram shows an unsafe use of an extension cable. What is the electrical hazard?

• The cables will get overheated.
• The appliances connected will burn out.
• There is loose connection.
• The fuse will burn out.

Which diagram shows possible currents at a junction in a circuit?

• A
• B
• C
• D

Which sentence describes a fuse that is rated 8 A?

• The fuse has a resistance of 8 W.
• The fuse will melt if the current exceeds 8 A.
• The fuse will not work if the current is less than 8 A.
• The fuse will only work if the current is 8 A.

What is represented by this electrical symbol?

• A bell 
• A fuse
• A resistor
• A switch

What is the SI unit for power?

• joule
• newton
• volt
• watt

What is represented by this electrical symbol?

• A bell 
• A fuse
• A resistor
• A switch