1. What is EMF Across Galvanometer?

The EMF (Electromotive Force) across a galvanometer refers to the potential difference that develops when different currents flow through it, causing the needle to deflect and allowing measurement of small electrical currents.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( V \) — EMF across galvanometer (Volts)
• \( R \) — Resistance of the galvanometer coil (Ohms)
• \( I_1 \) — First current reading (Amperes)
• \( I_2 \) — Second current reading (Amperes)

Explanation: The formula calculates the potential difference based on the resistance and the difference between two current measurements.

3. Importance of EMF Calculation

Details: Accurate EMF calculation is crucial for precise current measurements in electrical circuits, calibration of measuring instruments, and understanding the behavior of galvanometers in various electrical setups.

4. Using the Calculator

Tips: Enter resistance in ohms, both current values in amperes. Ensure all values are valid (resistance > 0).

5. Frequently Asked Questions (FAQ)

Q1: What is a galvanometer used for?
A: A galvanometer is used to detect and measure small electric currents through the deflection of a magnetic needle.

Q2: Why calculate EMF across a galvanometer?
A: Calculating EMF helps understand the voltage developed across the instrument, which is essential for accurate current measurements and circuit analysis.

Q3: What factors affect galvanometer readings?
A: Factors include coil resistance, magnetic field strength, current magnitude, and mechanical damping.

Q4: Can this formula be used for AC currents?
A: This specific formula is designed for DC currents. AC measurements require additional considerations for frequency and impedance.

Q5: How to ensure accurate measurements?
A: Use precise instruments, ensure proper calibration, minimize external magnetic fields, and take multiple readings for consistency.