When solving for both parallel and series circuits the rules stay the same when finding which quantity?

When solving for both parallel and series circuits the rules stay the same when finding which quantity?

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

Answer: (B)

Power is the quantity whose calculation rules stay consistent in both series and parallel circuits because the fundamental relation P = V × I (and the equivalent forms P = I²R or P = V²/R) applies to each element regardless of how the circuit is arranged. In a series circuit, the same current flows through all components while voltages add up; in a parallel circuit, the same voltage is across all branches while currents add up. The distribution of V and I changes with arrangement, but the way you compute power for each component and then sum them stays the same. For example, in series you can express total power as I² times the total resistance, while in parallel you can express it as V² times the sum of conductances, both derived from P = VI. This universality is what makes power the quantity with consistent rules across these configurations.

Power is the quantity whose calculation rules stay consistent in both series and parallel circuits because the fundamental relation P = V × I (and the equivalent forms P = I²R or P = V²/R) applies to each element regardless of how the circuit is arranged. In a series circuit, the same current flows through all components while voltages add up; in a parallel circuit, the same voltage is across all branches while currents add up. The distribution of V and I changes with arrangement, but the way you compute power for each component and then sum them stays the same. For example, in series you can express total power as I² times the total resistance, while in parallel you can express it as V² times the sum of conductances, both derived from P = VI. This universality is what makes power the quantity with consistent rules across these configurations.