Electric Current and Circuit Concepts

This video tutorial covers the basics of electric current, Ohm's Law, and electric power. It explains the flow of conventional current versus electron flow, and how to calculate current, voltage, and resistance using Ohm's Law. The tutorial also discusses electric power and its formulas, and includes problem-solving exercises on electric charge, voltage, resistance, power consumption, and cost calculation. The video aims to provide a comprehensive understanding of these fundamental electrical concepts.

What is the direction of conventional current flow in a circuit?

• From positive to negative terminal

• It does not flow

• In a circular motion

• From negative to positive terminal

How is electric current defined?

• As the amount of energy used

• As the rate of charge flow

• As the speed of electrons

• As the resistance in a circuit

According to Ohm's Law, what happens to the current if the voltage increases while resistance remains constant?

• The current decreases

• The current remains the same

• The current increases

• The current becomes zero

What is the relationship between resistance and current in a circuit?

• They are directly proportional

• They are inversely proportional

• They are not related

• They are equal

Which of the following is a correct form of the power equation?

• P = V + I

• P = V^2 / R

• P = I^2 / R

• P = V * R

How is electric power measured?

• In watts

• In volts

• In amperes

• In ohms

If a current of 3.8 amps flows for 12 minutes, how much charge passes through the circuit?

• 2736 coulombs

• 4560 coulombs

• 720 coulombs

• 3600 coulombs

What is the resistance of a light bulb if a 12V battery causes a current of 150mA to flow through it?

• 60 ohms

• 120 ohms

• 100 ohms

• 80 ohms

How much will it cost to operate a 1.8W bulb for a month if electricity costs 11 cents per kilowatt-hour?

• 14 cents

• 20 cents

• 50 cents

• 30 cents

What is the voltage across a motor that uses 50 watts of power and draws 400 milliamps of current?

• 200 volts

• 125 volts

• 100 volts

• 150 volts