What increases when components are added in series?

What increases when components are added in series?

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

Answer: (D)

In a series arrangement, the total resistance increases when you add more components. That's because the current has to pass through every element one after another, so the resistances simply add up: R_total = R1 + R2 + ... + Rn. With a fixed supply voltage, the current becomes I = V / R_total, so as R_total grows, the current through the circuit decreases. Since brightness in a device depends on the current through it, adding more series components usually reduces brightness. The total power drawn from the source also falls as resistance rises, since P_total = V^2 / R_total. So the quantity that increases when components are added in series is the total resistance.

In a series arrangement, the total resistance increases when you add more components. That's because the current has to pass through every element one after another, so the resistances simply add up: R_total = R1 + R2 + ... + Rn. With a fixed supply voltage, the current becomes I = V / R_total, so as R_total grows, the current through the circuit decreases. Since brightness in a device depends on the current through it, adding more series components usually reduces brightness. The total power drawn from the source also falls as resistance rises, since P_total = V^2 / R_total. So the quantity that increases when components are added in series is the total resistance.