Question

what is the resistance of an electric arc lamp when hot,if the lamp uses 20A when connected to a 220V ?

Answer 1

According to ohm's law
V= I x R

R = 220/20

= 11 ohms

Answer 2

Answer:

The resistance of an electric arc lamp is 11 Ω

Explanation:

Given:

Voltage = 220V

Current = 20A

We can calculate the resistance of an electric arc lamp by Ohm’s law.  

$\text { Voltage } =\text { Current } \times \text { Resistance }$

$\text { Resistance }=\frac{\text {Voltage}}{\text {Current}}$

$\text { Resistance }=\frac{220}{20}$

Resistance = 11 Ω

Resistance is a measure of the opposition to current flow in an ‘electrical circuit’. Resistance is measured in ohms. Voltage is a main function of the electrical circuit.