Electrical Supply

What will be the current drawn by an electric bulb of 1000 W when it is connected to a source of 220 V?
Remember: I = P/V

• 4.55 A

• 28800 J or 28.8 KJ

• 80 W

• 200 W

If the hair dryer and the vacuum cleaner are both on, what is the power used?

• 2600 watts

• 400 watts

• 2200 watts

• 1100 watts

Watts is the same as...

• Joules per second

• Voltage per second

• Current per second

Calculate the electric power of an electrical appliance in which 10 A of current is flowing through a resistor of 2 ohms.
 
Remember: V=IR and P=VI

• 80 W

• 200 W

• 2.5 A

• 22.5 KJ

If an oven has a power of 2000 W and the voltage is 230 V what fuse is required?

• 3A

• 5A

• 13A

A pair of 15-watt computer speakers are connected to a 12-volt power supply. What is the electric current running through the speakers?

• 1.25 A

• 0.8 A

• 12.5 A

• 180 A

A kilowatt (kW) is how many watts?

• 10

• 50

• 100

• 1000

Calculate the voltage applied when a 60 watt light-bulb uses a current of 5 amps

• 300 volts

• 30 volts

• 12 volts

• 0.08 volts

What is the power of a 20V bulb with 5A through it?

• 100W

• 100V

• 6.3W

• 6.3A

Heater is 240V and 2200W. What is the suitable fuse rating for the heater?

• 10 A

• 13 A

• 3 A

• 5 A

Tags

NGSS.HS-PS3-1