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by BlastRoom
Calculate electrical power and energy transferred in circuit elements, including kilowatt-hours.
#physics
40 questions
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A current of 3.0 A passes through an 8.0 Ω resistor. What power does the resistor dissipate?
A resistor has a potential difference of 12 V across it and a resistance of 6.0 Ω. What power is dissipated?
A small motor draws 0.50 A from a 9.0 V battery. What electrical power does the motor receive?
A 2.5 A current flows through a 4.0 Ω heating wire. How much power does the wire dissipate?
A lamp has 18 V across a 9.0 Ω filament. What power is dissipated in the filament?
A speaker coil has resistance 50 Ω and carries 0.20 A. What power is dissipated in the coil?
A charger supplies 2.0 A at a potential difference of 5.0 V. What power is delivered to the device?
A hot plate has 120 V across a 60 Ω heating element. What power does the element dissipate?
An LED strip operates at 12 V while drawing 1.5 A. What is its electrical power?
A 0.75 A current flows through a 16 Ω resistor. What power is dissipated by the resistor?
A 12 Ω resistor is connected across a 24 V supply. What power does the resistor dissipate?
A heater coil has resistance 2.0 Ω and carries 6.0 A. What power is dissipated in the coil?
A toy motor draws 0.30 A from a 3.0 V battery. What power does it receive?
A 5.0 Ω resistor has 15 V across it. What power is dissipated in the resistor?
A 1500 W electric heater runs for 2.0 h. Electricity costs $0.20 per kWh. What does the run cost?
A 60 W bulb is on for 5.0 min. How much energy does it transfer?
A 0.80 kW microwave oven runs for 0.25 h. How much electrical energy does it use?
A 200 W pump runs for 45 min. How much energy does it transfer?
A 2.0 kW dryer runs for 1.5 h. Electricity costs $0.18 per kWh. What is the cost?
A 40 W fan runs for 8.0 h. How much energy is this in kilowatt-hours?
A 90 W laptop charger runs for 3.0 h. At $0.14 per kWh, what is the cost to the nearest cent?
A lamp has 12 V across it and carries 2.0 A for 10 min. How much energy does it transfer?
A 1.2 kW kettle runs for 0.10 h. Electricity costs $0.25 per kWh. What is the cost?
A 750 W computer runs for 6.0 h. How much energy does it use?
Use the circuit figure. Read the ammeter and voltmeter values, then find the power dissipated by R1.
In the circuit figure, what power is dissipated by resistor R?
Use the meter readings in the circuit figure. How much power does R2 dissipate?
The circuit figure shows the current through a lamp and the potential difference across it. What power does the lamp dissipate?
Read the meters in the circuit figure. What is the power dissipated by R3?
Use the circuit figure to find the power dissipated by the resistor.
Use the table. Which device transfers more energy, and by how much?
Use the table. Which statement correctly compares the energy transferred?
Use the table. At $0.16 per kWh, which appliance costs more to run, and by how much?
Use the table. Which device transfers more energy, and by how much?
An electric bill lists a household's monthly use as 620 kWh. What quantity does 620 kWh measure?
Two resistors are each connected across the same 12 V source: one is 6.0 Ω and the other is 12 Ω. Which statement is correct?
A 4.0 Ω resistor and an 8.0 Ω resistor are in series, so the same current passes through both. Which dissipates more power?
In a circuit, what directly determines which bulb is brighter?
Which unit is equivalent to one watt?
A 100 W lamp runs for 1.0 h. Which statement correctly expresses the energy in kilowatt-hours?
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Magnetic Fields from Currents
30 questions
