The Basic lessons · Basic electronics and theory · B-005-013

Measuring Voltage, Current, and Power Safely

Learn how to connect voltmeters and ammeters correctly to avoid damaging your equipment or getting false readings. Understand which instrument measures what, and why accuracy matters in your radio station.

This lesson is part of SignalPrep Pro. The subsection's 10 exam questions are free to practise: practise B-005-013.

What this subsection asks

• How is a voltmeter usually connected to a circuit under test?
• How is an ammeter usually connected to a circuit under test?
• What does a multimeter measure?
• What is the correct instrument to measure the final power amplifier current?
• When measuring the voltage across a circuit component, what does the voltmeter appear to be in the circuit?
• When measuring current drawn from a DC power supply, what does the ammeter placed in the circuit appear as?
• What instrument can provide a direct measurement of power at the output of a transmitter?
• Potential difference is measured by means of:
• What instrument is used to measure electrical current?
• What term describes the ability of an instrument to display values that are true to reality?