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Questions and Answers
What is the unit of electric current?
Which law describes the relationship between voltage, current, and resistance?
What happens to the resistance of a conductor when its temperature increases?
Which of the following represents direct current?
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What two factors determine the electric power consumed in a circuit?
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Study Notes
Electric Current
- The unit of electric current is the ampere (A).
Ohm's Law
- Ohm's law describes the relationship between voltage, current, and resistance.
- It states that the current flowing through a conductor is directly proportional to the voltage applied across its ends and inversely proportional to the conductor's resistance.
- Mathematically, this is represented as V = I * R, where V is the voltage, I is the current, and R is the resistance.
Effect of Temperature on Resistance
- The resistance of a conductor generally increases with increasing temperature.
- This is because as temperature rises, the atoms within the conductor vibrate more vigorously, making it harder for electrons to flow through.
Direct Current (DC)
- Direct current (DC) is characterized by a constant flow of electrons in one direction.
- This is in contrast to alternating current (AC), where the direction of electron flow changes periodically.
Electric Power
- The electric power consumed in a circuit is determined by two factors:
- Voltage (V): The potential difference across the circuit.
- Current (I): The rate of flow of charge through the circuit.
- The power (P) consumed is calculated using the formula P = V * I.
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Description
Test your knowledge on fundamental concepts of electricity including electric current, Ohm's law, and factors affecting resistance and power in circuits. This quiz is perfect for students learning the basics of electrical principles.
