Question

When 5A current is flowing through a resistor, 15 V potential difference is generated across the resistor. The
resistance is
20 ohm
3 ohm
10 ohm
75 ohm​

Answer 1

Given

• Current (I) = 5A
• Potential Difference (V) = 15V

Find out

• Resistance (R) = ?

Solution

As we know that

→ V = IR

→ 15 = 5 × R

→ 15 = 5R

→ R = 15/5

→ R = 3 ohm

Hence, 3 ohm is the correct option

★ Note ★

Resistance → It is the property of conductor to oppose the flow of current.

Answer 2

◙ Given ◙

When 5A current is flowing through a resistor, 15 V potential difference is generated across the resistor.

• Current, I = 5 A
• Potential difference, V = 15 V

◙ Objective ◙

To find if the resistance is

(a) 20 Ω

(b) 3 Ω

(c) 10 Ω

(d) 75 Ω

◙ Solution ◙

By Ohm's law, we know,

$\boxed{\sf{\color{red}{V=IR}}}$

→ Potential difference = Current × Resistance

Substituting the values :-

$\sf{\hookrightarrow 15=5\times R}\\\\\sf{\hookrightarrow R=\dfrac{15}{5}}\\\\\boxed{\color{lime}{\sf{\hookrightarrow R=3\ \Omega}}}$

Therefore, the answer is (b) 3 Ω.

$\rule{180}2$

Ohm's law is a law that states that the voltage across a resistor is directly proportional to the current flowing through the resistance.