Physics: A cooker of 240 V has a power rating of 3.84 kW. How much current does it draw? What is the resistance of the cooker?

A cooker of 240 V has a power rating of 3.84 kW.

yalley1982

18.07.2020

$4.2\times10^3 W$

$2.67\times 10^4 W$

Explanation:

Given:

Mass of the rider plus the bike, $m=2\times10^2 kg$

Speed of the motorbike, u= 20 m/s

Force of resistance, $F=2.1\times10^2N$

Power necessary to sustain speed can be calculated as follows:

1. When road is level

Power = force x velocity

P= F x u

$P=(2.1\times10^2N)(20 m/s) = 4.2\times10^3 W$

2. When the road is sloped at an angle 35°

An additional force will act due to component of gravity that is

$= mg sin \theta$

So,

$P = (F+mgsin\theta)u\\ P= (2.1\times10^2+2\times10^2\times 9.8 \times sin35^o)(20)=2.67\times 10^4 W$

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