The 6.0 watt, 12 volt bulb is connected in a circuit with a 1,500-watt, 120 volt
ID: 3164128 • Letter: T
Question
The 6.0 watt, 12 volt bulb is connected in a circuit with a 1,500-watt, 120 volt toaster, an adjustable resistor; and a 120 volt power supply. The circuit is designed such that the bulb and the toaster operate at the given values and, if the light bulb fails, the toaster will still function at these values. c. On the diagram below, draw in wires connecting the components shown to make a complete circuit that will function as described above. 120 -Volt H 6.0 W Supply n 12-Volt 120 Volt Adjustable Toaster Bulb. 1,500Explanation / Answer
The toaster and the bulb must be connected in parallel so that the toaster receives 120 Volts.
Since the only requires 12 Volts, the variable resistor must be connected in series with it. If the resistance of this adjustable resistor is increased, the voltage drop across it will increase and since it is connected in series to the bulb, it will reduce the voltage drop across the bulb. This will in return reduce the brightness of the bulb.
Power dissipated by the toaster = (Voltage drop across the toaster)2 / (Resistance of the toaster)
since the resistance of the toaster and the voltage drop across it is constant, the power dissipated will not change if the adjustable resistance is increased.
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