Power, Voltage, and Resistance Concepts

The video tutorial covers three examples related to electrical power. The first example calculates the charge passing through a device using given power and voltage. The second example determines the energy dissipated by a lamp over a time interval using current and voltage. The third example finds the final voltage in a circuit when the power consumption of a bulb changes, assuming constant resistance.

What is the charge passing through a 15-watt device connected to a 10-volt battery over four hours?

• 1.08 x 10^4 coulombs

• 2.16 x 10^4 coulombs

• 4.32 x 10^4 coulombs

• 3.24 x 10^4 coulombs

What is the power formula used in the first example?

• Power = Voltage - Current

• Power = Current x Voltage

• Power = Voltage / Current

• Power = Current / Voltage

How do you calculate the current flowing through a device if you know the power and voltage?

• Add power and voltage

• Divide power by voltage

• Multiply power by voltage

• Subtract voltage from power

In the second example, what is the energy dissipated by the lamp in two minutes?

• 324 joules

• 216 joules

• 432 joules

• 108 joules

What is the formula for calculating energy dissipated using power and time?

• Energy = Power / Time

• Energy = Power x Time

• Energy = Power + Time

• Energy = Power - Time

If a 100-watt bulb is designed for 120 volts, what is the final voltage when it consumes only 90 watts?

• 114 volts

• 116 volts

• 112 volts

• 110 volts

What remains constant in the third example when calculating the final voltage of the bulb?

• Voltage

• Current

• Power

• Resistance

How is power related to voltage and resistance in the third example?

• Power = Voltage x Resistance

• Power = Voltage + Resistance

• Power = Voltage^2 / Resistance

• Power = Resistance / Voltage

What is the initial power consumption of the bulb in the third example?

• 110 watts

• 100 watts

• 90 watts

• 80 watts

What is the voltage applied to the bulb to achieve 100 watts of power?

• 100 volts

• 130 volts

• 110 volts

• 120 volts