Look What You Can Do With Ohm’s Law

My career in radio broadcast engineering has been aided tremendously by an understanding of Ohm’s Law, the brick and mortar of electronic engineering. This easy-to-understand knowledge tells the story of how things work and helps immensely in diagnosing a problem. The mystery of “how does it work or what went wrong” often goes away when Ohm’s Law is applied.

The answer is in front of you on the chart in Fig. 1. Solve for voltage (E) in volts, current (I) in amperes, resistance (R) in ohms or power (P) in watts when you know two of the values. You might use this knowledge on a transmitter where meters show volts and current. These aren’t just numbers, they mean something. On a tube transmitter it could be 8000 volts. When multiplied by 3 amperes of current, it equals 24,000 watts input power. Then there might be a 75% power amplifier efficiency to give a power output of 18,000 watts. Look at the original transmitter test sheet to find the factory measured efficiency. Simplify the math by using a calculator or smartphone app.

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