Question

Gud morning....

Determine the resistance of a certain resistor that dissipates 0.2 W when the current is 50 mA.​

Answer 1

ANSWERS:

80 ohms is the required answer

Explanation:

According to the Question

It is given that ,

Power ,P = 0.2 W

current ,I = 50mA

We need to calculate the resistance of the resistor .

Firstly we change the unit here .

Current

1mA = 1/1000

50mA = 50/1000 = 0.05 A

Now,

calculating the resistance of the resistor.

Relationship between Resistance , Power & Current .

P = I²R

where,

P denote Power

I denote Current

R denote Resistance

Substitute the value we get

➺ 0.2 = 0.05² × R

➺ 0.2 = 0.0025 × R

➺ R = 0.2/0.0025

➺ R = 80 ohm

So, the required option is (a) 80 ohm.

HOPE IT IS HELPFUL FOR YOU.

Answer 2

Answer:

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Step-by-step explanation:

According to the Question

It is given that ,

Power ,P = 0.2 W

current ,I = 50mA

We need to calculate the resistance of the resistor .

Firstly we change the unit here .

Current

1mA = 1/1000

50mA = 50/1000 = 0.05 A

Now,

calculating the resistance of the resistor.

Relationship between Resistance , Power & Current .

P = I²R

where,

P denote Power

I denote Current

R denote Resistance

Substitute the value we get

➺ 0.2 = 0.05² × R

➺ 0.2 = 0.0025 × R

➺ R = 0.2/0.0025

➺ R = 80 ohm