Question

What current will be needed to produce a voltage of 5 volts cross a 12,000 ohm resistor?
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Answer 1

Answer:

0.417 mA

Explanation:

According to Ohm's Law,

the current flowing through a conductor is directly proportional to the potential difference applied across its ends, keeping physical conditions such as the temperature constant.   (A VERY IMPORTANT LAW)

Thus, mathematically it can be expressed as

V∝ I

V=IR where, V = potential difference, I = current flowing in the conductor, and R = constant of proportionality or resistance

From, the equation,

I= V/R (THIS PRINCIPLE IS USED IN THE QUESTION)

Now coming to the question,

Given,  

potential difference (V) = 5V

resistance (R) = 12000 Ω. = 12 X 10³Ω

Current (I) = ?

As derived above,

I=V/R = 5/12 X 10³ = 0.417 X 10 ⁻³ A = 0.417 mA

Ans - 0.417 mA