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# Capacitors in a Circuit - PowerPoint PPT Presentation

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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### Capacitors in a Circuit

emf

Resistors

series

parallel

Circuit problems

Capacitors in a circuit

Electrical power is

• P = IV

• P = Ed

• P = I2R

• P = qV

• None of the above.

• Two or more of the above.

Electrical power is

• P = IV

• P = Ed

• P = I2R

• P = qV

• None of the above.

• Two or more of the above.

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

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

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

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

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.

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.

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

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

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

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

What is the current in the 600 W resistor?

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

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

What about measuring the voltage of a old battery?

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.

V

Ideal Ammeter

Rs

Rs = 0 for an ideal ammeter

Kirchhoff’s Rules

• 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

• 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.

• 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.

• Now lets see a charging capacitor.

For times less than one

time constant

For times greater than a

few time constant

• 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