Question

1) What determines the rate at which energy is
delivered by an electric current?
5) An electric motor takes 5 A from a 220 V line
Calculate
1) the power of the motor
) the energy consumed by it in 30 seconds.​

Answer 1

Answer:

(1st ) power is the rate of consumption of energy.

- P= E/T.

(2nd ) P= VI

so, P=220×5= 1100W.

then,E= VIT

E= 220×5×30= 33000J.

Hope it helps.

Answer 2

$\mathfrak{\large{\underline{\underline{Answer:-}}}}$

1) The power determines the rate at which energy is delivered by an electric current.

$\mathfrak{\large{\underline{\underline{Given:-}}}}$

Amount of current comsumed by electric motor = 5 A

Voltage = 220 V

$\mathfrak{\large{\underline{\underline{To find:-}}}}$

1) Power of the motor = ?

2) Energy consumed by it in 30 sec.

$\mathfrak{\large{\underline{\underline{Solution:-}}}}$

We have a relationship between power,current and voltage.

I. e, ★ $\boxed{\sf{ P = V × I}}$

put the value of V and I

$\implies$ $\bold{P = 220 × 5}$

$\implies$ $\mathfrak{\large{\underline{\underline{P = 1100 w or 1.1 kw}}}$

Now,Energy consumed is given by :-

★ $\boxed{\sf{E = P × T}}$

put the value of P and T.

$\implies$ $\bold{E = 1100 × 30}$

$\implies$ $\bold{E = 33,000 j or 33 kj}$

hence,the power of motor is 1100 watt and the electrical energy consumed by motor in 30 sec is 33000 j.