The brightness of a bulb will be reduced, if a resistance is connected in

To reduce the brightness of a light bulb, should an auxiliary resistance be connected in series with it or in parallel?

A bulb is connected in series with a variable capacitor and an ac source as shown . What happens to the brightness of the bulb when the key is plugged in an capacitance of the capacitor is gradually reduced?

when bulbs are conneted to the same source, the brightness of bulb connected in series is more than the brightness of identical bulbs connected in parallel.

An capacitor C, a variable resistor R and a bulb B are connected in series to the ac mains in circuits as shown in Fig. The bulb glows with some brightness. How will the glow of the bulb change if the resistance R is increased keeping the same capacitance.