Question

A lamp draws a current of 0.50 A when it is connected to a 120 V source? What is the resistance of the lamp?

Answer 1

Given,
Current (I) = 0.50A
Voltage (V) = 120 volts
Resistance (R) =?
We know that:-
Voltage (V) = Current (I) x Resistance (R)
→Resistance (R) = Voltage (V) / Current (I)
= 120/0.50
= 24Ω
∴ Resistance (R) = 24Ω

Answer 2

For this case we have that by definition, Ohm's Law states that:

$V = I * R$

Where:

V: It's the voltage

I: It's the current

R: It's the resistance

According to the data we have to:

$I = 0.50A\\V = 120V$

Clearing the resistance formula we have:

$R = \frac {V} {I}\\R = \frac {120} {0.50}\\R = 240$

So, the resistance is 240 ohms!

Answer:

240Ω