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Resistance & Ohm's Law

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Resistance & Ohm's Law

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About this activity

Basic rocks around resistance

Created by

Shairoz Anis
Shairoz Anis
Pakistan

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Resistance & Ohm's Law
 

Resistance & Ohm's LawOnline version

Basic rocks around resistance

by 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.
 
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