Electricity and Resistance Notes

  • Resistance Formula

    • Ohm's Law: R=VIR = \frac{V}{I}

  • Learning Outcomes

    1. Understand potential difference and resistance definitions and units.
    2. Apply resistance equation for calculations.
    3. Design circuits online based on specifications.

  • Key Concepts

    • Voltage (Potential Difference)

    • Voltage is required for current to flow.

    • Measured in volts (V) using a voltmeter.

    • Provided by cells or batteries.

    • Resistance

    • Measured in ohms (Ω).

    • Indicates difficulty for current to flow.

    • Increased resistance leads to reduced current.

    • Adders in series (e.g., bulbs) increase total resistance hence reducing current.

  • Ohm’s Law

    • Discovered by Georg Ohm (1787-1854).
    • Establishes relationship between voltage, current, and resistance.

  • Practical Application

    • Perform resistance calculations based on worksheets and information triangles before online tasks.