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Which of the following draws no current ...

Which of the following draws no current from the voltage source being measured:

A

Potentiometer

B

Meter bridge

C

Wheatstone bridge

D

Both (a) and (c)

Text Solution

AI Generated Solution

The correct Answer is:
To determine which device draws no current from the voltage source being measured, we need to analyze the options provided. The key concept here is understanding how different devices interact with a voltage source. ### Step-by-Step Solution: 1. **Understanding the Devices**: - We need to identify the devices that can be used to measure voltage without drawing current from the source. Common devices include voltmeters, ammeters, and potentiometers. 2. **Analyzing the Potentiometer**: - A potentiometer is a device used to measure voltage by balancing it against a known voltage. It operates on the principle of null deflection, meaning it does not draw any current from the voltage source when measuring. 3. **Comparing with Other Devices**: - **Voltmeter**: A voltmeter is designed to measure voltage but does draw some current from the circuit, which can affect the measurement. - **Ammeter**: An ammeter measures current and is connected in series with the circuit, thus it draws current from the source. - **Potentiometer**: As mentioned earlier, it does not draw current from the source because it measures voltage by creating a balance. 4. **Conclusion**: - The device that draws no current from the voltage source being measured is the **potentiometer**. ### Final Answer: The correct answer is **Potentiometer**.
To determine which device draws no current from the voltage source being measured, we need to analyze the options provided. The key concept here is understanding how different devices interact with a voltage source. ### Step-by-Step Solution: 1. **Understanding the Devices**: - We need to identify the devices that can be used to measure voltage without drawing current from the source. Common devices include voltmeters, ammeters, and potentiometers. 2. **Analyzing the Potentiometer**: ...
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