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?

PARALLEL CIRCUITS

More than one current path

PARALLEL CIRCUIT

Potential difference is constant

V = V1 =V2 = V3 = … = Vn

PARALLEL CIRCUIT

Current through the entire circuit is equal to the sum of the currents through all the resistances

I = I1 + I2 + I3 + … + In

PARALLEL CIRCUIT

Ohm’s law holds true for each resistor

Vn = InRn

PARALLEL CIRCUITReq is less than any single resistance in the circuit

If more resistance is added, Req decreases and total current increases because there is another independent path in which charges can flow

What is Req of the circuit to the right? 2Ω

3Ω

4Ω

If there is a voltage source of 10 V attached, what is the total current through the circuit?

2Ω

3Ω

4Ω

If there is a voltage source of 10 V attached, what is the current traveling through each resistor?

2Ω

3Ω

4Ω

• What is the voltage across each bulb?• What is the current in each branch? • What is Req?• What is the total current provided by the

battery?

• What is the voltage across each resistor?• What is the current in each branch? • What is Req?• What is the total current provided by the

battery?

EXIT QUIZ

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 Ω2 Ω12 V