Join 60,000+ competitive exam aspirants
or with email
Your Cart
SubtotalтВ╣0
TotalтВ╣0
Examoogle тАв User тАв info@examoogle.com тАв EE-2024-8821
Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
Join 60,000+ competitive exam aspirants
Which instrument is used to measure potential difference?
Galvanometer
Voltmeter
Ohmmeter
Ammeter
None of the above
Voltmeter
A voltmeter is an instrument designed specifically to measure the potential difference (voltage) between two points in an electrical circuit. It is always connected in parallel across the components for which the potential difference is to be measured.
A voltmeter is an instrument designed specifically to measure the potential difference (voltage) between two points in an electrical circuit. It is always connected in parallel across the components for which the potential difference is to be measured.
Think of a voltmeter as a pressure gauge on a pipe; just as the gauge measures the difference in water pressure between two points without stopping the flow of water, a voltmeter measures the electrical pressure (potential difference) without blocking the flow of electricity.
Volts measure the pressure of the 'Voltage' flow.
V=I├ЧR тАФ Ohm's Law where V is potential difference, I is current, and R is resistance.
RvтАЛтЖТтИЮ тАФ The ideal voltmeter has infinite internal resistance.
A voltmeter works on the principle that it must not significantly alter the current in the main circuit. Therefore, it is designed with very high internal resistance to ensure that a negligible amount of current passes through it, allowing it to measure the potential difference accurately without loading the circuit.
A voltmeter must always be connected in parallel.
Ideal voltmeters have infinite resistance to prevent current draw.
The SI unit of potential difference is the Volt (V).
It measures the energy per unit charge moved between two points.
High input impedance prevents circuit loading.
Direct and easy reading of voltage values.
Real-world voltmeters are not perfectly ideal and have finite, albeit very high, resistance.
Requires parallel connection which can be complex in crowded circuits.
Testing battery charge levels.
Diagnosing faults in electrical appliances by checking voltage drops.
Galvanometer detects current, Ammeter measures current (series), Ohmmeter measures resistance.
Option A (Galvanometer) is for detecting small currents, C (Ohmmeter) for resistance, and D (Ammeter) for current flow.
B is correct тАФ The voltmeter is the standardized electrical instrument used to measure the potential difference between two points.
Always remember the mnemonic 'Amps in Series, Volts in Parallel' to quickly distinguish between Ammeter and Voltmeter connection requirements.
Get instant step-by-step AI explanations, full shift Previous Year Papers (SSC GD, RRB, SSC JE), and regional rank analysis on the official Examoogle App.
Free Download тАв 100K+ Aspirants