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Questions and Answers
What is the unit of electric current?
What is the unit of electric current?
How is electric current related to time and charge?
How is electric current related to time and charge?
What is the SI unit of electric potential?
What is the SI unit of electric potential?
What instrument is used to measure current in a circuit?
What instrument is used to measure current in a circuit?
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According to Ohm's Law, how is current related to potential difference?
According to Ohm's Law, how is current related to potential difference?
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What property of a conductor opposes the flow of electric current?
What property of a conductor opposes the flow of electric current?
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Study Notes
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.
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Description
Test your knowledge on concepts related to electric current including definitions, units, measurement instruments, and the flow of electrons in a circuit. Questions cover key topics in electric current theory.
