When a device is used in a circuit in which the voltage is 81 V, the current flowing through the device is 3 A. What's the resistance of the device?

Question

Question 13 options:

A)

40.5 A

B)

243 Ω

C)

27 Ω

D)

243 A

Answer 1

To calculate the resistance of the device, you can use Ohm's Law, which states:

\[ R = \frac{V}{I} \]

Where:

• \( R \) is the resistance in ohms (Ω),
• \( V \) is the voltage in volts (V),
• \( I \) is the current in amperes (A).

In this case, the voltage \( V = 81 , \text{V} \) and the current \( I = 3 , \text{A} \).

Now, substituting the values into the formula:

\[ R = \frac{81 , \text{V}}{3 , \text{A}} = 27 , \text{Ω} \]

So the resistance of the device is 27 Ω.

The correct answer is C) 27 Ω.