Question

What is the resistance of 1000W,220V toaster?
CLASS 10 PHYSICS

Answer 1

Answer:

In any electrical appliance their is a simple relationship between the power output of a component, the potential difference across that component, and the current running through it. This is because charge times potential difference is energy, so (charge per unit time) times (potential difference) gives (energy per unit time). Thus, we have P=VI.

Substituting I=V/R from ohm's law, the power relationship can be rewritten as P=

R

V

2

. From this formula, the resistance can be calculated as follows.

P=

R

V

2

that is, R=

P

V

2

. The power and voltage are given as100W and 220V.

Therefore, R=

100

220

2

=

100

48400

=484Ω.

Hence, the resistance of the bulb is 484 Ω.

Answer 2

Explanation:

48 ohms

A 1000 watt toaster running on 220 is going to consume 4.55 Amps. The element resistance is 220 / 4.55 or 48 ohms.