Electricity Basics Quiz

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.