Power Flashcards
A 10 V battery supplies a resistive load of 10 ohms for 1 minute. What is the power supplied?
10 W
A resistor dissipates 80 Watts. If it runs for 4 hours 15 minutes, how much energy is dissipated in total?
1.224 MJ
The earth lead of a 24 V equipment is 0.5 ohm resistance and carries 80 A. How much power does it dissipate?
3.2 kW
What is the power dissipated in a 500 ohm resistor with a 3A flow?
4.5 kW
A DC circuit containing a total resistance of 100 ohms has a current flow of 250 mA. The power dissipated in the circuit is.
6.25 watts
Power is the rate of doing work. It is measured in.
joules/second
The power in a circuit when voltage and resistance is given can be found by.
V*V / R
A 500 ohm resistor carries a 3 amp current. What is the power dissipated?
4.5 kW
A 3 ohm resistor dissipates 27 Watts. How much current flows through it?
3 A
A 48-volt source is required to furnish 192 watts to a parallel circuit consisting of three resistors of equal value. What is the value of each resistor?
36 ohm
A piece of equipment is rated at 750 watts and the applied voltage is 30 volts. The value of the protection fuse should be.
30 amps
How much power must a 24-volt generator furnish to a system which contains the following series loads? 5 ohm, 3 ohm and 12 ohm.
28.8 watts
A direct current of 12 milliamperes flows through a circuit which has a resistance of 1000 ohms. The power dissipated by the circuit is.
144 milliwatts
In a power circuit, the purpose of an inductor is.
to dampen power surges
In the circuit shown, the power developed across the 10 kilo ohm resistor is.
250 mW
A single phase circuit has an input voltage of 100V. The current is 10A and the circuit has a power factor of 0.5. The true power is.
500W
Power in a DC circuit is found by.
multiplying the resistance by the current squared
If the energy supplied to a circuit for 4hrs 15 minutes at 800 j/sec what would be the energy consumed?
3.4 KW Hrs
A heater which consumes 800 Kilojoules/sec is on for 4hrs 15min. The energy consumed is.
3400 kWh
A voltage of 250V causes a current of 30mA. What is the wattage?
7.5W
Which requires the most electrical power during operation?
Two lights requiring 3 amperes each in a 24volt parallel system
The power dissipated in a circuit with a known potential difference and resistance is calculated by.
finding the current and multiplying the answer by the resistance. OR dividing the square of the potential difference by the resistance.
The power expended in a given circuit is.
proportional to the square of the voltage
