WorksheetsChapter 4: Building Electricity (i)
Total questions: 21
Worksheet time: 11mins
Ampere (A) is one of basic units electrical energy and it is refer as :
Unit of electrical billing by TNB
Unit of electrical power or consumption of electrical power
Measure of electrical force
Unit to measure electricity flow
___________ measures the electrical energy that is used in the house.
ELCB circuit breaker
Main switch
MCB circuit breaker
Electric meter
The voltage of the alternating current is highest at the
branch substation
power station
National Grid Network
_______ carries electric current to an electrical appliances.
Earth wire
Live wire
Neutral wire
Volt (V) is one of basic units electrical energy and it is refer as :
Unit of electrical billing by TNB
Unit of electrical power or consumption of electrical power
Measure of electrical force
Unit to measure electricity flow
Choose the step-up transformer
A
B
C
_______ returns electric current to the branch substation.
Neutral wire
Live wire
Earth wire
_______ connects an electrical appliances directly to the Earth.
Neutral wire
Live wire
Earth wire
___________ disconnects the current supply temporarily when it is not needed (such as during repairing damaged wiring).
ELCB circuit breaker
Main switch
Electric meter
MCB circuit breaker
___________ cuts off the current supply in the house when excessive current flows through it.
Main switch
ELCB circuit breaker
Electric meter
MCB circuit breaker
___________ separates the final circuit into the other parts of electrical equipment like air conditioner circuit and controls the quantity of current flows through it.
Electric meter
Main switch
MCB circuit breaker
ELCB circuit breaker
The main supply of electrical energy in a house has a voltage of
240 V
33 kV
415 V
The flowchart shows the sequence of the components in the electricity transmission and distribution system.
Power station -----> _____________ -----> National Grid Network ----> Main substation ----> _____________ ----> _____________ ----> Branch substation ----> Step-down transformer
Step-up transformer, step-down transformer, switch zone
Switch zone, step-up transformer, step-down transformer
Step-up transformer, switch zone, step-down transformer
Switch zone, step-down transformer, step-up transformer
The voltage of alternating current, a.c., is ___________ before it is transmitted through the National Grid Network.
Decreased
Increased
The _______ enables electricity to be transmitted to the branch substation when needed
National Grid Network
Switch zone
Transformer
If an electrical appliance uses current of 11 A, which is the suitable value of fuse to be used.
5 A
10 A
13 A
15 A
Choose the safety components found in wiring system at home.
Lightning conductor, MCB circuit breaker, ELCB circuit breaker, Main switch
Lightning conductor, Main switch, Electric meter, MCB circuit breaker
Main switch only
Electric meter only
Mei Ling got an electric shock while ironing her clothes. The following information shows the steps taken by his brother to help her.
P- Calls an ambulance
Q- Remove electrical source using an insulator
R- Switches off the main power supply
S- Perform mouth to mouth resuscitation if the victim is not breathing.
Which sequence is correct?
P, Q, R, S
P, R, Q, S
R, Q, P, S
R, Q, S, P
2-pin plugs are not connected to the earth wire.
TRUE
FALSE
Substation is a part of an electrical generation which:
transfers electrical energy from one electric circuit to another, without changing the frequency
transform voltage from high to low, or the reverse, or perform any of several other important functions
detects small stray voltages on the metal enclosures of electrical equipment, and interrupts the circuit if a dangerous voltage is detected.
cuts off the excess current in the circuit
Two method of supplies:
1) to pass conductor cable or bars into isolation or fused switches at each floor.
2) to pass conductor into and out of a subsidiary distribution board at each floor.
This method is refer to:
Ring/Loop distribution system
Radial distribution system
Rising main distribution system
