Understanding Electrical Voltage and Power

This video introduces the concepts of electrical voltage and power, explaining atomic structure, electron movement, and how voltage acts as potential energy to move charges. It covers voltage sources, circuit flow, and the calculation of power using the formula P=IV. The video also discusses the roles of source and load in circuits and examines power usage in various applications, from small electronics to large transmission lines.

What is the primary reason electrons move between atoms to create electrical current?

• They are naturally attracted to each other.

• They are repelled by protons.

• They are influenced by a charge that attracts or repels them.

• They are pushed by neutrons.

How is voltage defined in terms of energy and charge?

• Energy per charge

• Energy per time

• Charge per energy

• Charge per time

What unit is used to measure voltage?

• Amperes

• Watts

• Joules

• Volts

What must be true for current to flow in a circuit?

• The circuit must have no voltage source.

• The circuit must be open.

• The circuit must be closed.

• The circuit must have a single terminal.

What is the relationship between power, current, and voltage in a circuit?

• P = I + V

• P = I / V

• P = V / I

• P = I * V

What is the unit of power in electrical circuits?

• Volts

• Watts

• Amperes

• Joules

What is the role of a power source in a circuit?

• To consume power

• To store power

• To dissipate power

• To provide power

Which of the following is an example of a power source?

• Switch

• Battery

• Resistor

• Light bulb

What is the typical voltage output of a standard USB port?

• 15 volts

• 1 volt

• 10 volts

• 5 volts

What is the approximate power capacity of large transmission lines?

• 500 watts

• 5,000 watts

• 500,000 watts

• 500 million watts