An electric kettle connected to the 230 V mains supply draws a current of 10 A. Calculate:

(a) the power of the kettle.
(b) the energy transferred in 1 minute.

Open in App

Solution

(a) Power, P = VI = 230 $\times$ 10 = 2300 W
(b) Energy transferred in one minute = P $\times$ t
= 2300 W $\times$ 60 s (1 minute = 60 s)
= 138000 J
= 138 kJ

Suggest Corrections

Similar questions

An electric kettle connected to the 230 V mains supply draws a current of 10 A. Calculate :

(a) the power of the kettle.

(b) the energy transferred in 1 minute.

Q. The table below shows the current in three different electrical appliances when connected to the 240 V mains supply:

Appliance	Current
Kettle	08.5 A
Lamp	0.4 A
Toaster	4.8 A

(a) Which appliance has the greatest electrical resistance? How does the data show this?
(b) The lamp is connected to the mains supply by using a thin, twin-cored cable consisting of live and natural wires. State two reasons why this cable should not be used for connecting the kettle to the mains supply.
(c) Calculate the power rating of the kettle when it is operated from the 240 V mains supply.
(d) A main takes the kettle abroad where the mains supply is 120 V. What is the current is the kettle when it is operated from the 120 V supply?

The table below shows the current in three different electrical appliances when connected to the 240 V mains supply :

Appliance current

Kettle 8.5 A

Lamp 0.4 A

Toaster 4.8 A

(a) Which appliance has the greatest electrical resistance ? How does the data show this ?

(b) The lamp is connected to the mains supply by using a thin, twin-cored cable consisting of live and neutral wires. State two reasons why this cable should not be used for connecting the kettle to the mains supply.

(d) A man takes the kettle abroad where the mains supply is 120 V. What is the current in the kettle when it is operated from the 120 V supply ?

An electric kettle for use in a 230 V supply is rated at 3000 W. For safe working what should be the current carried by a cable connected to it?

Q. An electric iron is connected to the 230 V mains supply. A current of 8 A flows through the iron. How much energy is transferred to the heater each second?

Join BYJU'S Learning Program

An electric kettle connected to the 230 V mains supply draws a current of 10 A. Calculate: (a) the power of the kettle. (b) the energy transferred in 1 minute.

(a) Power, P = VI = 230 × 10 = 2300 W (b) Energy transferred in one minute = P × t = 2300 W × 60 s (1 minute = 60 s) = 138000 J = 138 kJ

An electric kettle connected to the 230 V mains supply draws a current of 10 A. Calculate:

(a) the power of the kettle.
(b) the energy transferred in 1 minute.

(a) Power, P = VI = 230 $\times$ 10 = 2300 W
(b) Energy transferred in one minute = P $\times$ t
= 2300 W $\times$ 60 s (1 minute = 60 s)
= 138000 J
= 138 kJ