THE BRIGHTNESS OF LIGHT EMITTED BY A BULB IS OBSERVED TO DECREASE WHEN AN ELECTRIC HEATER IS CONNECTED IN SERIES WITH IT.SUGGEST THE LIKELY REASON FOR THIS OBSERVATION.
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A light bulb glows when a voltage is applied across the bulb. The greater the voltage, the higher the current and the brighter the bulb will glow. The brightness is related to the power dissipated by the bulb and power is calculated by multiplying the voltage by the current.
If an electric heater is added, the voltage across the bulb will be reduced. The current through the bulb will be lower because the voltage across the bulb is also lower. Therefore, the power dissipated in the bulb will be lower and the bulbs will be dimmer.
If an electric heater is added, the voltage across the bulb will be reduced. The current through the bulb will be lower because the voltage across the bulb is also lower. Therefore, the power dissipated in the bulb will be lower and the bulbs will be dimmer.
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