Electricity

What is an electrical safety device that operates to protect overcurrent of an electrical circuit?

• fuse & circuit breaker

• double insulation

• earthing and grounding system

• None of the above

What circuit connection is advisable in lights using bulbs?

• parallel

• series

• Both series and parallel

• None

What problem occurs when too many branches are added resulting to the total amount of current exceeding the safe level that the circuit can handle?

• Circuit overload

• electric shock

• low voltage

• short circuit

What electrical hazard is caused by an unintentional construction of a least resistance path between two conductors supplying electrical energy?

• overloading

• electric shock

• low voltage

• short circuit

Which statement describes current in a parallel circuit?

• It splits across the branches

• It stays the same throughout

• It splits up through each component

• All the above

Answer explanation

The current in a parallel circuit splits into different branches then combines before it goes back to the supply.

Which of the following statements is TRUE about series circuits?

• requires the use of a lot of wires

• cannot increase or multiply the voltage

• Increased circuit components leads to a greater circuit resistance

• If too many connections are added, the total amount of current can exceed the safe level

  of current that the circuit can handle

Which among the following is considered to be the rate at which charge is flowing?

• circuit

• current

• resistance

• voltage

How do you calculate current?

• resistance x voltage

• resistance ÷ voltage

• voltage x resistance

• voltage ÷ resistance

How do you calculate voltage?

• current x resistance

• current ÷ resistance

• resistance ÷ current

• measure it with a ruler

Which of the following is NOT an electrical safety device?

• antenna

• circuit breaker

• fuse

• double insulation