Question

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 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**.