Transmit Success with the 2025 Ham Radio Technician Test – Tune Up Your Skills and Conquer the Airwaves!

Question: 1 / 470

How many watts are consumed when a current of 7.0 milliamperes flows through a 1,250-ohm resistance?

Approximately 61 milliwatts

To determine the power consumed when a current of 7.0 milliamperes flows through a 1,250-ohm resistance, we can use the formula for electrical power, which is given by:

\[ P = I^2 \times R \]

Here, \( P \) represents power in watts, \( I \) is the current in amperes, and \( R \) is the resistance in ohms. It's important to convert milliamperes to amperes for this calculation.

1. Convert the current from milliamperes to amperes:

\[

I = 7.0 \text{ mA} = 0.007 \text{ A}

\]

2. Substitute the values into the power formula:

\[

P = (0.007)^2 \times 1250

\]

\[

P = 0.000049 \times 1250

\]

\[

P = 0.06125 \text{ W}

\]

3. Converting watts to milliwatts:

\[

P \approx 61.25 \text{ mW}

\]

This calculation shows that the

Get further explanation with Examzify DeepDiveBeta

Approximately 85 milliwatts

Approximately 20 milliwatts

Approximately 50 milliwatts

Next Question

Report this question

Download Transmit Success with the 2025 Ham Radio Technician Test – Tune Up Your Skills and Conquer the Airwaves! PDF Study Guide
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy