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Capacitors in a CircuitPowerPoint Presentation

Capacitors in a Circuit

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Capacitors in a Circuit. emf Resistors series parallel Circuit problems Capacitors in a circuit. Reading Question. Electrical power is. P = IV P = Ed P = I 2 R P = qV None of the above. Two or more of the above. Reading Question. Electrical power is. P = IV P = Ed P = I 2 R

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Reading Question

Electrical power is

- P = IV
- P = Ed
- P = I2R
- P = qV
- None of the above.
- Two or more of the above.

Reading Question

Electrical power is

- P = IV
- P = Ed
- P = I2R
- P = qV
- None of the above.
- Two or more of the above.

Reading Question

What property of a real battery makes its potential difference slightly different than that of an ideal battery?

1. Short circuit

2. Chemical potential

3. Internal resistance

4. Effective capacitance

5. Inductive constant

Reading Question

What property of a real battery makes its potential difference slightly different than that of an ideal battery?

1. Short circuit

2. Chemical potential

3. Internal resistance

4. Effective capacitance

5. Inductive constant

Reading Question

In an RC circuit, what quantity is represented by the symbol

1. Period

2. Torque

3. Terminal voltage

4. Time constant

5. Coefficient of thermal expansion

Reading Question

In an RC circuit, what quantity is represented by the symbol

1. Period

2. Torque

3. Terminal voltage

4. Time constant

5. Coefficient of thermal expansion

Reading Question

The equivalent resistance for a group of series resistors is

1. less than any resistor in the group.

2. equal to the smallest resistance in the group.

3. equal to the average resistance of the group.

4. larger than any resistance in the group.

5. larger than any resistor in the group.

Reading Question

The equivalent resistance for a group of series resistors is

1. less than any resistor in the group.

2. equal to the smallest resistance in the group.

3. equal to the average resistance of the group.

4. larger than any resistance in the group.

5. larger than any resistor in the group.

Class Question

What is the potential at points a to e ?

1. Va = 0, Vb = -4 V, Vc = -10 V, Vd = -12 V, Ve = -20 V

2. Va = -20 V, Vb = -16 V, Vc = -10 V, Vd = -8 V, Ve = 0 V

3. Va = 20 V, Vb = 16 V, Vc = 10 V, Vd = 8 V, Ve = 0 V

4. Va = -4 V, Vb = -6 V, Vc = -2 V, Vd = -8 V, Ve = 0 V

5. Va = 4 V, Vb = 6 V, Vc = 2 V, Vd = 8 V, Ve = 0 V

Class Question

What is the potential at points a to e ?

1. Va = 0, Vb = -4 V, Vc = -10 V, Vd = -12 V, Ve = -20 V

2. Va = -20 V, Vb = -16 V, Vc = -10 V, Vd = -8 V, Ve = 0 V

3. Va = 20 V, Vb = 16 V, Vc = 10 V, Vd = 8 V, Ve = 0 V

4. Va = -4 V, Vb = -6 V, Vc = -2 V, Vd = -8 V, Ve = 0 V

5. Va = 4 V, Vb = 6 V, Vc = 2 V, Vd = 8 V, Ve = 0 V

Class Question

Rank in order, from brightest to dimmest, the identical bulbs A to D.

1. A = B = C = D

2. A > B > C = D

3. A > C > B > D

4. A > C = D > B

5. C = D > B > A

Class Question

Rank in order, from brightest to dimmest, the identical bulbs A to D.

1. A = B = C = D

2. A > B > C = D

3. A > C > B > D

4. A > C = D > B

5. C = D > B > A

Another Problem

What is the current in the 600 W resistor?

Voltage Measurement

To measure the potential difference or voltage across an element we connect the two voltage leads to the ends of the element.

Voltage Measurement

What is the effect of connecting a voltmeter (DMM) to an element?

This is the resistance of the voltmeter (DMM). This resistance is more like 10 MW

If 10 MW and 1kW

Voltage Measurement

What about measuring the voltage of a old battery?

Current Measurement

To measure the current through an element we break the circuit and place the current meter (DMM) in the circuit so that current flows through the meter.

Charging a Capacitor

Kirchhoff’s Rules

Discharging a Capacitors

- Write Kirchhoff’s voltage equation for discharging a capacitor.
- The charge on the capacitor decrease while the charge through the resistor increases.
- Integrate the equation

Discharging a Capacitor

- Write the equation for current and voltage for a discharging capacitor.
- Use the definition of capacitance and the charge equation to find the equation for the voltage across the capacitor.

Charging a Capacitor

- Are the graphs for a charging capacitor the same? Discuss this.
- Discuss these equations in your group and make sure you all understand and can explain these equations in terms of the characteristic of the capacitor.

Charging a Capacitor

- Now lets see a charging capacitor.

For times less than one

time constant

For times greater than a

few time constant

Capacitors in a Circuit

- Now lets see what effect a capacitor has in a circuit?

For times less than one

time constant

For times greater than a

few time constant

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