the amount of electric power used by a lamp that has a resistance of 20.0 Ohms...
If a lamp has a resistance of 25 ohms, what must the resistance of a second lamp, which is connected in parallel to the first, be for the total resistance to be 18.75 ohms?
Three identical lamps are connected in parallel and powered by a 6-Volt battery. Each lamp has 3 ohms of resistance. How much total current is delivered by the battery?
1. A lamp (R = 147 ohms), an electric heater (R = 24 ohms), and a fan (R = 49 ohms) are connected in parallel to an extension cord plugged into a 117 V outlet. (a) What total current is supplied to the circuit? (b) What is the voltage across the fan? (c) What is the current in the lamp? (d) What power is expended in the heater?
If 91.8 volt power supply is connected to a lamp with resistance 1.1 ohm. What would be the magnetic field induced at a point 6.1 centimeter away from the lamp?
A 20.0- lamp and a
5.0- lamp are
connected in series and placed across a potential difference of
50.0 V. What is
a. the equivalent resistance of the circuit?
b. the current in the circuit?
c. the voltage drop across each lamp?
d.the power dissipated in each lamp?
The tungsten filament of an incandescent lamp has a resistance of 200 Ohms at room temperature. A) What would the resistance be at an operating temperature of 1600 C? B) Assuming it is plugged into a 120-V outlet, what is its power output when just starting up? C) By how much does its power output change from the room temperature value when it is at its operating temperature?
Resistors of 3 Ohms, 9 Ohms, and 11 Ohms are connected purely in parallel to a 12 volt battery. All of these resistors dissipate different amounts of power. What is the greatest amount of power dissipated by one of these resistors in Watts?
A long copper wire has a resistance of 33 Ohms. A second copper wire is a factor of 5 times shorter than the first wire. (It is the same area, however.) If the second wire is connected to a 24 volt battery, what is the current in the wire in amps?
A long copper wire has a resistance of 30 Ohms. A second copper wire is a factor of 4 times shorter than the first wire. (It is the same area, however.) If the second wire is connected to a 25 volt battery, what is the current in the wire in amps?
A battery of internal resistance 0.5 ohms is connected to a load of resistance 4 ohms. If the battery has an EMF of 6.0 volts, what is the terminal voltage when it is under load?