Definition
A high-value resistor connected in series with a voltmeter movement to extend its measuring range. The multiplier drops most of the applied voltage across itself, allowing only a small, safe current through the meter movement, so the meter can read voltages much higher than its basic movement could handle alone.
Plain English
An extra resistor placed in line with a voltmeter so it can safely measure higher voltages. It absorbs most of the voltage, leaving only a tiny amount for the meter itself to register.
Context Anchor
Seen in aircraft electrical system maintenance, especially when discussing meter circuits and voltage measurements.
Derivation
Multiplier comes from the Latin multiplicare, meaning to increase or extend. The name fits: the resistor multiplies the voltage range the meter can read without changing the meter movement itself.
Why Pilots Care
For pilots, the practical point is that aircraft voltage readings depend on properly working measuring circuits. A faulty meter circuit can give a misleading indication of electrical system health.
Intuition Check
A voltmeter multiplier does not multiply the aircraft’s voltage. It limits the current through the meter so the meter can safely indicate a higher voltage.
Example Sentence 1
The technician installed a multiplier resistor in series with the voltmeter so it could read up to 300 volts without damaging the movement.
Example Sentence 2
Choosing the correct voltmeter multiplier prevented overload while checking alternator output under load.