Question

Find the energy in kwh consumed in 10 hours by four devices of power 100 W
each.

Answer 1

Answer:

• 4kWh is the required answer.

Explanation:

Given:-

• Power of Device ,P = 100 W

• Time taken ,t = 10 hour

• Number of Device ,n = 4

To Find:-

• Energy Consumed ,E

Solution:-

Energy Consumed by Devices can be calculated by the product of their power & the time by taken by the Devices.

• E = P× t

where,

• E denote Energy Consumed
• P denote power each device
• t denote time taken

Substitute the value we are

→ E = (4×100) × 10

→ E = 400 × 10

→ E = 4000 Wh

As we know,

1 kWh = 1000 Wh

→ therefore, 4000 Wh = 4000/1000 kWh = 4kWh.

• Hence, the energy consumed by the devices is 4 kWh .

Answer 2

Answer:

Given :-

• Power of Device = 100 Watt
• Time taken = 10 hours
• Numbers of Device = 4

To Find :-

Energy consumed

Solution :-

As we know that

$\huge \boxed{ \rm \: E = p \times t}$

E is the Energy

P is the Power of 1 device

T is the Time taken

$\sf \implies \: E = (100 \times 4) \times 10$

$\sf \implies \: E = (400) \times 10$

$\sf \implies \: E = 400 \times 10$

$\sf \implies \: E = 4000 \: W$

$\huge \sf \: W - kW$

$\sf \: 1000 \: W = 1 \:kW$

$\sf \: 4000 \: W = \cancel \dfrac{4000}{1000} = 4 \:kW$