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1. Ohms Law

2. George Simon Ohm “Current is directly proportional to Voltage and inversely proportional to Resistance”

3. - In mathematical terms, V = I x R where V is Voltage, I is Current, and R is Resistance

4. Understanding Ohm’s Law Ohm’s law may be easier to understand with an analogy. Current flowing through a wire is like water flowing through a hose.

5. Increasing voltage with a higher-volt battery increases the current. This is like opening the tap wider so more water flows through the hose.

6. Increasing resistance reduces the current. This is like stepping on the hose so less water can flow through it.

7. Increasing the resistance, decreases the flow of current…

8. Example 1: If the resistance of an electric iron is 50 Ω and a current of 3.2 A flows through the resistance. Find the voltage between two points. Solution: If we are asked to calculate the value of voltage with the value of current and resistance, then cover V in the triangle. Now, we are left with I and R or more precisely I × R. Therefore, we use the following formula to calculate the value of V: V = I × R Substituting the values in the equation, we get V = 3.2 A × 50 Ω = 160 V

9. Example 2: An EMF source of 8.0 V is connected to a purely resistive electrical appliance (a light bulb). An electric current of 2.0 A flows through it. Consider the conducting wires to be resistance-free. Calculate the resistance offered by the electrical appliance. Solution: When we are asked to determine the value of resistance when the values of voltage and current are given, we cover R in the triangle. This leaves us with only V and I, more precisely V ÷ I. Substituting the values in the equation, we get R = V ÷ I R = 8 V ÷ 2 A = 4 Ω

10. Voltage Resistance Current 100 V 2.5 A 50 Ω 10 A 250 V 3 Ω 90 V 3 A 120 V 2 Ω Activity: Complete the Table using Ohm’s Law

11. 1. A subwoofer needs a household voltage of 110 V to push a current of 5.5 A through its coil. What is the resistance of the subwoofer? Quiz: 2. A 12 Volt car battery pushes charge through the headlight circuit resistance of 10 ohms. How much current is passing through the circuit? 3. What current flows through a hair dryer plugged into a 120 Volt circuit if it has a resistance of 25 ohms? 4. If a toaster produces 12 ohms of resistance in a 120-volt circuit, what is the amount of current in the circuit? 5. How much voltage would be necessary to generate 10 amps of current in a circuit that has 5 ohms of resistance?

12. Solve for the unknown in each of these circuits 1. 3. 2. 4. 5.