Resistance & Ohm's Law

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Basic rocks around resistance

Shairoz Anis

Pakistan

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Resistance & Ohm's LawVersion en ligne Basic rocks around resistance par Shairoz Anis 1 Slide 1: What is resistance? Resistance is the opposition to current flow in a circuit, measured in ohms (Ω). It depends on material and geometry. 2 Slide 2: Ohm's Law Ohm's Law relates voltage (V), current (I), and resistance (R) as V = I × R. 3 Slide 3: Units & Symbols The unit ohm (Ω) equals volts per ampere. Symbols: V for voltage, I for current, R for resistance. 4 Slide 4: What affects resistance? Resistance depends on material, temperature, cross-sectional area, and length of the conductor. 5 Slide 5: Rearranging Ohm's Law From V = I × R, derive I = V/R and R = V/I for different problems. 6 Slide 6: Simple example Consider a 9V battery with a 3Ω resistor. Current is I = V/R = 9/3 = 3 A. 7 Slide 7: Current calculation Another case: 12 V across 4 Ω results in I = 12/4 = 3 A. 8 Slide 8: Power relation Power can be found as P = V × I or P = I² × R. 9 Slide 9: Series & parallel In series, resistances add. In parallel, 1/R equals the sum of 1/Ri. 10 Slide 10: Quick recap Resistance determines current for a given voltage. Use Ohm's Law to analyze circuits and check units.