Answer to Question #202733 in Electric Circuits for Kwanele Maseko

Question

The teacher School needs to light up a 9.0 volts bulb, but has a car battery rated at 12.0 volts in the laboratory and a number of connecting wires, resistors, a variable resistor, a voltmeter, an ammeter, a switch, and other devices that can be useful in getting the 9.0 volts needed.you are to design a potential divider to produce the 9.0 volts needed from the materials given, without using a transformer

1. Using calculations, indicate the values of the resistors in the set-up to give you the desired 9.0V.        

2.The bulb becomes dimmer over time with continuous use, not giving out the desired brightness. Suggest what can be done to restore the same brightness as before, without changing the 12.0 V battery.  

2.The bulb becomes dimmer over time with continuous use, not giving out the desired brightness. Suggest what can be done to restore the same brightness as before, without changing the 12.0 V battery.  

Answer 1

V=IR