Question

Calculate the resistance of a resistor if the current flowing through it is 200mA and the applied potential difference is 0.8V

Answer 1

Hey!

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Voltage (V) = 0.8V
Current (I) = 200 mA = 200/10^3 = 2/10

Resistance = ?

Resistance = Voltage / Current

Voltage = Current × Resistance

0.8 = 2/10 × Resistance

0.8×10/2 = Resistance

8/2 = Resistance

Resistance = 4 ohm

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Hope it helps...!!!

Answer 2

Hi.

Here is your answer---

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Given---

Potential Difference(V) = 0.8 V
Current(I) = 200 mA

   We know the Relation,
        1 A = 10³ mA
 
 ⇒   1 mA = (10)^-3 A

Thus,  200 mA = 200 × (10)^-3
                        = 0.2 A.

For Resistance,

Using the Ohm's Law,

         V = I × R
     ⇒ R = V/I
        R = 0.8/0.2
    ⇒  R = 4 Ω.

Thus, the Resistance of the Resistor is 4 Ohm.

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Hope it helps.

Have a nice day.