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EMF and Internal Resistance
EMF and Internal Resistance

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... 50. A person accidentally leaves a car with the lights on. The two front lights use 40 W each and the two rear lights use 6 W each. How long will a fresh 12 V battery last if it is rated at 75 Ah? Assume the full 12 V appears across each bulb. (9 hours and 47 minutes) The total power consumed is 2 × ...
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... or digital (uses a display much like a digital clock). Integrated circuits have made digital logic so inexpensive that an electronic timer is now less expensive than many mechanical and electromechanical timers. Individual timers are implemented as a simple single-chip computer system, similar to a ...
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Electrical ballast



An electrical ballast is a device intended to limit the amount of current in an electric circuit. A familiar and widely used example is the inductive ballast used in fluorescent lamps, to limit the current through the tube, which would otherwise rise to destructive levels due to the tube's negative resistance characteristic.Ballasts vary in design complexity. They can be as simple as a series resistor or inductor, capacitors, or a combination thereof or as complex as electronic ballasts used with fluorescent lamps and high-intensity discharge lamps.
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