Electric Current Concepts Quiz

Electric Current and Charge

• Electric current is the rate of flow of electric charge in a circuit.
• Current is given by the formula I = Q/t, where I is the current, Q is the charge, and t is time.
• The SI unit of electric current is ampere (A).

Electric Potential

• Electric potential is a quantity that determines the direction of flow of electrons when two charged conductors are joined by a metallic wire.
• Electric potential (V) is given by the formula V = W/q, where W is the work done and q is the charge.
• The SI unit of electric potential is volt (V), where 1 V = 1 J/C.

Potential Difference

• Potential difference is the difference in electric potential between two points.
• Potential difference is given by the formula V1 - V2 = W/q, where W is the work done and q is the charge.
• Potential difference is measured by an instrument called a voltmeter.

Ohm's Law

• Ohm's Law states that, at constant temperature, the current flowing through a conductor is directly proportional to the potential difference across its ends.
• The law is expressed mathematically as I ∝ V, or I = V/R, where R is the resistance of the conductor.

Resistance

• Resistance is the property of a conductor that opposes the flow of electric current through it.