Question

When a 12V battery is connected across an unknown resistor, a
current of 2.5mA flows in the circuit. Calculate the value of the
resistance of the resistor.​

Answer 1

Answer:Hey friend

here is your answer

voltage (v) = 12 V

current (I) = 2.5 A

resistance(r) = ? ( to find )

as,

V = I × r

12 =2.5 × r

r = 4.8 ohm

therefore the resistance offered by the circuit be 4.8 ohm

glad to help you

hope it helps

thank you.

Explanation:Hope this helps u plz mark me as the brainliest

Answer 2

Answer:

The battery connected with unknown resistor, draws 2.5 mA of current. The resistance can easily be calculated through the derived formula of resistance.  

Given:

Voltage (V) = 12 V

Current (I):

$\implies$ $\sf{2.5\:mA}$

$\implies$ $\sf{2.5 \times 10^{3}\:A}$

$\implies$ $\sf{0.0025\:A}$

We know that:

The resistance is given by as the divisional product of voltage to current.

We have:

$\boxed{\sf{Resistance = \frac{Voltage}{Current}}}$

$\sf{R = \frac{V}{I}}$

$\sf{R = \frac{ 12 }{0.0025}}$

$\sf{R = \frac{120000}{25}}$

$\sf{R = 4800}$ Ω

Therefore:

The value of the resistance of the resistor is 4800 Ω.