Home Chapter 19 Practice Questions

# Practice Questions

This activity contains 25 questions.

## A 1.5 volt battery is connected to a voltmeter with infinite internal resistance. The voltage read is

 a little less than 1.5 volts. 1.5 volts. a little greater than 1.5 volts.

## A 1.5 volt battery is connected to a voltmeter with infinite internal resistance. The 1.5 volt battery is next checked with a voltmeter which has an internal resistance of only 500 ohms on the scale being used. If the meter reads 1.1 volts, you can conclude

 that the voltmeter does not work. that the actual voltage is .4 volts. that the battery has developed a rather high internal resistance.

## Five volts is applied to two 2 ohm resistors in series. The resulting current is

 5 A. 2.5 A. 1.25 A. Not enough information is given.

## Five volts is applied to two 2 ohm resistors connected in parallel. The resulting current is

 5 A. 2.5 A. 1.25 A. 1 A.

## Six volts is applied to a 2 ohm resistor in series with two 2 ohm resistors connected in parallel. The current through the first resistor is

 3 A. 2 A. 1 A. .5 A.

## What is the equivalent resistance to the three resistors on the left in the above figure?

 10 ohms 9 ohms 5 ohms 4 ohms

## What is the current drawn from the battery in the circuit?

 6 A 4 A 2 A 2/3 A

## What is the current through the 20 ohm resistor on the left in the figure?

 1/15 A 2/15 A 3/15 A 4/15 A

## What is the voltage drop across the three resistors on the left in the circuit in the above question?

 6 V 4 V 2 2/3 V 0 V

## What is the voltage drop across the 20 ohm resistor in the circuit?

 6 V 4 V 2 V 0 V

## In the above question what is the current through the upper 10 ohm resistor?

 1.5 A 0.6 A 0.3 A 0 A

## What is the current through the 20 ohm resistor above?

 0.3 A 0.6 A 0.9 A 1.2 A

## Which of the following equations is Kirchhoff's first rule as applied to the above circuit?

 I1 + I2 + I3 = 0 I1 - I2 + I3 = 0 I1 + I2 - I3 = 0 I1 - I2 - I3 = 0

## Which of the following is not a legitimate application of Kirchhoff's second rule to the circuit in the previous question?

 6 - 20*I1 - 6 + 20*I2 = 0 -6 - 20*I3 + 20*I1 = 0 -20*I2 + 6 + 20*I3 = 0 -6 - 20*I3 - 20*I1 = 0

## What is I1 in the circuit in Question 13?

 -0.1 A 0.1 A -0.2 A 0.2 A

## What is I3 in the circuit in Question 13?

 -0.1 A 0.1 A -0.2 A 0.2 A

## What is the equivalent capacitance of the two capacitors in series in the figure?

 10 microF 20 microF 30 microF 40 microF

## What is the charge on the 30 microF capacitor in the circuit in Question 17?

 40 C .00054 C 1389 C .00018 C

## What is the voltage across C2 (above)?

 18 V 12 V 9 V 6 V

## You have three capacitors C1= 15 pF, C2= 35 pF and C3= 50 pF. How can you arrange them to get an equivalent capacitance of 25 pF?

Close the switch in the above circuit by pressing the button below and find the time constant of the circuit.
 t= seconds V= volts

 3.0 seconds 4.5 seconds 6.0 seconds 9.2 seconds

## If the capacitor in the circuit in the above question is 3 microF, what is the resistance?

 100 ohms 2000 ohms 300000 ohms 2 Meg ohms

## What is the energy stored in the capacitor at t = 10 seconds.

 100 microJ 10 microJ 150 microJ 80 microJ

The above circuit is discharged by closing the switch. What is its time constant?
 t= seconds V= volts

 3 seconds 5 seconds 7 seconds 12 seconds.

## If the resistance in the circuit in Question 24 is 1000 ohms, what is the capacitance?

 4 x 10-9 F 2 x 10-6 F 4 x 10-3 F 3 x 10-3 F