What has the same value in a series circuit, no matter where ammeter goes?

What has the same value in a series circuit, no matter where ammeter goes?

• A. Voltage
• B. Current
• C. Resistance
• D. Power

Answer: (B)

In a series circuit there’s only one path for current, so the same amount of charge flows through every component. An ammeter is placed in series to measure that flow, and because the current must be identical along that single path, the reading doesn’t change no matter where the meter is placed in the loop (assuming an ideal meter with negligible resistance). Voltage, on the other hand, can vary from point to point because it drops across each component according to its resistance, so the same current can correspond to different voltages across different parts of the circuit. The overall current is set by the total resistance and the supply voltage, not by where the meter sits.

In a series circuit there’s only one path for current, so the same amount of charge flows through every component. An ammeter is placed in series to measure that flow, and because the current must be identical along that single path, the reading doesn’t change no matter where the meter is placed in the loop (assuming an ideal meter with negligible resistance).

Voltage, on the other hand, can vary from point to point because it drops across each component according to its resistance, so the same current can correspond to different voltages across different parts of the circuit. The overall current is set by the total resistance and the supply voltage, not by where the meter sits.