Physics 2 - Electricity

  • Electric Current

    • Definition: The rate of flow of charge.
    • Units: Measured in Amperes (A).

  • Charge (Q)

    • Definition: Electricity involves the movement of electrons, which have a negative charge.
    • Measurement: Charge is measured in Coulombs (C).
    • Formula: Q=I×tQ = I \times t (Where I = current in Amps, t = time in seconds).

  • Resistance (R)

    • Definition: Anything that opposes electric current.
    • Units: Measured in Ohms (Ω).
    • Calculation: R=VIR = \frac{V}{I} (Voltage in Volts, Current in Amps).

  • Ohm's Law

    • Important equation: R=VIR = \frac{V}{I}.
    • Learn and apply in problems to find resistance, voltage, or current.

  • Types of Circuits

    • Series Circuit: Current is the same at all points; voltage is shared among components.
    • Parallel Circuit: Current splits among branches; voltage remains constant across each branch.

  • Power (P)

    • Definition: The rate at which energy is used in a circuit.
    • Formula: P=V×IP = V \times I (Power in Watts, Voltage in Volts, Current in Amps).

  • Energy Transfer

    • Equation: E=P×tE = P \times t (Energy in Joules, Power in Watts, Time in seconds).

  • Static Electricity

    • Definition: Charge that builds up on an object.
    • Examples: Charging objects through friction (balloons, rods).
    • Phenomenon: Charges can repel or attract depending on their signs.