1. What is the equivalent resistance of this circuit? What is the current running through the first resistor? What is the potential difference drop across the last resistor?

2. PARALLEL CIRCUITS More than one current path

3. PARALLEL CIRCUIT Potential difference is constant V = V 1 =V 2 = V 3 = … = V n

4. PARALLEL CIRCUIT Current through the entire circuit is equal to the sum of the currents through all the resistances I = I 1 + I 2 + I 3 + … + I n

5. PARALLEL CIRCUIT Ohm’s law holds true for each resistor V n = I n R n

6. PARALLEL CIRCUIT R eq is less than any single resistance in the circuit  If more resistance is added, R eq decreases and total current increases because there is another independent path in which charges can flow

7. What is R eq of the circuit to the right? 2Ω2Ω 3Ω3Ω 4Ω4Ω

8. If there is a voltage source of 10 V attached, what is the total current through the circuit? 2Ω2Ω 3Ω3Ω 4Ω4Ω

9. If there is a voltage source of 10 V attached, what is the current traveling through each resistor? 2Ω2Ω 3Ω3Ω 4Ω4Ω

10. What is the voltage across each bulb? What is the current in each branch? What is R eq ? What is the total current provided by the battery?

11. What is the voltage across each resistor? What is the current in each branch? What is R eq ? What is the total current provided by the battery?

12. EXIT QUIZ

13. 1. What is the equivalent resistance of this circuit? 2. What is the voltage across the 4Ω resistor? 3. What is the current through the 4Ω resistor? 4. What is the total current through the circuit? 4 Ω2 Ω 12 V