Domestic Appliance Electrical Quiz

If an appliance needs 3kW in a domestic property, what is the fuse size?

• 10 amp

• 12.5 amp (13)

• 15 amp

• 20 amp

Answer explanation

So W divided by V

Watts = 3Kw = 3000w it mentions domestic property so power must be 240V

Therefore 3000/240= 12.5 and nearest fuse size is 13 amp

In a domestic property, an appliance has a fuse size of 3 amp. What is the maximum power rating of the appliance, remember you have the (V)oltage because of domestic property (240v) and you have the (A)mps (3amp) so you need the (W)atts therefore A x V = 240 x 3 = Kw ?

• 720W or 0.72kW

• 500W or 0.5kW

• 1000W or 1kW

• 1500W or 1.5kW

An appliance has a 5 amp fuse and needs 1.2kW of power. What is the voltage required remember this time you have the A and the W?

• 240V

• 220V

• 200V

• 180V

What would be the resistance of a domestic appliance if the fuse size was 3 amp so you have the (V)olts (domestic appliance) and the (I)amps and need the (R)esistance so V/I = ?

• 60 ohms

• 80 ohms

• 100 ohms

• 120 ohms

What is the fuse size for a domestic appliance which has 1,200 ohms resistance? so this time you have the (V)olts and (R)esistance V/R =

• 0.1 amp

• 0.2 amp

• 0.3 amp

• 0.4 amp

If an appliance has a fuse rated at 13 amp, and the resistance is 32 ohms, what would the voltage be? so you have the (I) amps and the (R)esistance and need the (V)oltage = I x R =

• 415 volts

• 420 volts

• 425 volts

• 430 volts

Calculate the fuse rating on a 720 watt lamp used in a domestic property.

• 2 amps

• 3 amps

• 5 amps

• 7 amps

Answer explanation

72/230= 0.31 nearest fuse is 3amp

Calculate the fuse rating on a 1200 watt drill used in a domestic property.

• 3 amps

• 5 amps

• 7 amps

• 9 amps

Answer explanation

W/V 1200/240= 5amps

Calculate the fuse rating on a 1320 watt drill used on a 110V on-site electrical system.

• 10 amps

• 12 amps

• 13 amps

• 15 amps

Answer explanation

W/V = 1320w/110v (swear down) = 12amps nearest fuse is 13 amp

You have just fitted a 7KW shower in a domestic property, calculate the fuse rating.

• 20 amps

• 25 amps

• 30 amps

• 32 amps

Answer explanation

W/V = 7000/230 = 30.4 amps nearest is 32 amp