Worksheets9189PH3ELECTPPT7
Total questions: 15
Worksheet time: 8mins
What is the run current of a bore hole pump that is fed by a 230V supply and has a power rating of 0.75 kW?
3.26 A
2.30 A
0.75 A
7.50 A
According to Ohm's Law, which formula represents the relationship between voltage (V), current (I), and resistance (R)?
V = I × R
I = V ÷ R
R = V ÷ I
All of the above
Using the power triangle, how do you calculate power (P) if you know the current (I) and voltage (V)?
P = I ÷ V
P = I × V
P = V ÷ I
P = V × I
If you need to find the voltage (V) using the power triangle and you know the power (P) and current (I), which formula would you use?
V = P × I
V = P ÷ I
V = I ÷ P
V = I × P
What is the correct formula to calculate resistance (R) using Ohm's Law?
R = V × I
R = I ÷ V
R = V ÷ I
R = I × V
How is the size of a cable measured?
In meters (m)
In kilograms (kg)
In cross-sectional area (CSA) and normally stated in mm²
In cubic meters (m³)
What is the overcurrent protective device rating for a radial circuit using BS1363 socket outlets according to the table?
20 A
30 or 32 A
2.5 A
1.5 A
What is the maximum floor area served by a ring circuit using BS1363 socket outlets with an overcurrent protective device rating of 30 or 32 A?
50 m²
75 m²
100 m²
25 m²
For a radial circuit with a 30 or 32 A overcurrent protective device rating, what is the minimum live conductor cross sectional area for copper conductor mineral insulated cables?
1.0 mm²
1.5 mm²
2.5 mm²
4 mm²
What size cable is generally used for lighting according to the rule of thumb provided?
1.5mm² twin and earth
2.5mm² twin and earth
6.0mm² twin and earth
10.0mm² twin and earth
Which cable size is suitable for a ring final main?
1.5mm² twin and earth
2.5mm² twin and earth
6.0mm² twin and earth
10.0mm² twin and earth
What is the recommended cable size for a smaller electric shower (7kW)?
1.5mm² twin and earth
2.5mm² twin and earth
6.0mm² twin and earth
10.0mm² twin and earth
For a larger electric shower (11kW), which cable size should be used?
1.5mm² twin and earth
2.5mm² twin and earth
6.0mm² twin and earth
10.0mm² twin and earth
What can happen to cable insulation if the surrounding temperature is too high?
Insulation may become more efficient
Insulation may change color
Insulation may melt
Insulation may turn into a conductor
What is the specific meaning of IP65 rating?
6 for heat protection and 5 for moisture protection
6 for intrusion protection and 5 for electrical resistance
6 for intrusion protection and 5 for moisture protection
6 for electrical resistance and 5 for intrusion protection
