Question

Voltmeter in a circuit is connected in :

• A. parallel
• B. series
• C. in any way
• D. none of these

Hint:

Remember the "P" in {P}otential difference (Voltage) and {P}arallel:
{V}oltmeter measures {V}oltage (Potential Difference) and is connected in {P}arallel.
{A}mmeter measures current ({A}mperes) and is connected in {S}eries. (No "P" here to help remember). A voltmeter needs to "see" the voltage across a component, so it branches off in parallel.

Answer 1

The Correct Option is A

Concept: A voltmeter is an instrument used to measure the electric potential difference (voltage) between two points in a circuit. How it's connected is crucial for a correct measurement and for the proper functioning of the circuit. Step 1: What does a voltmeter measure? A voltmeter measures the difference in electrical potential (voltage drop) {across} a circuit component (like a resistor, bulb) or between any two points. Step 2: How to connect a voltmeter to measure voltage ACROSS a component To measure the voltage across a component, the voltmeter must be connected so that its terminals are at the same two points as the component whose voltage is being measured. This means the voltmeter is connected in parallel with that component.
One terminal of the voltmeter is connected to one end of the component.
The other terminal of the voltmeter is connected to the other end of the component. This way, the voltmeter experiences the same potential difference as the component. Step 3: Why not in series? If a voltmeter were connected in series with a component, it would be part of the main current path. An ideal voltmeter has very high internal resistance (to draw minimal current and not disturb the circuit it's measuring). If placed in series, this high resistance would significantly reduce the current in the circuit, altering the very voltage it's trying to measure and affecting the circuit's operation. (An ammeter, which measures current, is connected in series and has very low resistance). Step 4: Analyzing the options
(1) parallel: Correct. A voltmeter is connected in parallel across the points where voltage is to be measured.
(2) series: Incorrect. This is how an ammeter is connected.
(3) in any way: Incorrect. The connection method is specific.
(4) none of these: Incorrect, as parallel is the correct method.