Mod 3 unit 2 quizzes

The resistance of a resistor can sometimes be determined by its color code. Another way is to measure it with:

an ohmmeter.

The sum of the series voltage drops:

equals the applied voltage

If the current through a resistor is doubled, the power consumed by the resistor becomes:

four times the original power.

Two lights are connected in series. If one light burns out, the other light will:

go out also.

In a parallel circuit, total current:

is equal to the sum of the branch currents.

Other factors remaining constant, what would be the effect on the current flow in a circuit if the applied potential were doubled?

it would double

With resistances of 100 ohms, 200 ohms, 300 ohms, 400 ohms, and 500 ohms connected in parallel, the total resistance will be:

less than 100 ohms.

Three resistors are connected in parallel. They have values of 2 kilohms, 4 kilohms, and 8 kilohms. Total resistance is:

less than two kilohms.

How many paths are there for electron flow in a series circuit?

one

Two lights are connected in parallel and one burns out. The other light will:

remain as it was.

In a d-c parallel circuit:

the sum of the branch currents equals the total current.

With two resistances connected in parallel:

the voltage across each resistor must be the same.

How much current will flow in a 120 volt, 60 watt incandescent light?

0.5 amperes

The current in a 60 watt, 120 volt electric light bulb is:

0.5 amperes.

Four 24 volt instrument panel lights, each having a resistance of 36 ohms, are connected in parallel with each other and in series with a dimmer switch who's resistance is 15 ohms. How much current will be drawn by this circuit?

1 amp

A resistor is expending 25 watts of power with 5 amperes flowing. What is the resistance of the resistor?

1 ohm

What is the total resistance of six resistors in parallel, if each resistor is 6 ohms?

1 ohm.

Three resistors connected in parallel draw a total current of 6 amps. R1 = 10 ohms, R2 = 12 ohms, and the voltage drop across R3 is 24 volts. What is the current through R3?

1.6 amps

How many 50 ohm resistors, connected is series, would be required to limit current flow to .2 amperes with an applied voltage of 100 volts?

10.

There are three resistors of equal value connected in parallel. The total resistance is four ohms. What is the resistance of each resistor?

12 ohms

A group of ten lamps is connected in parallel to a 12 volt source. If one more lamp is added in parallel, what will be the new voltage drop across each lamp?

12 volts.

A lamp has a source voltage of 110 volts and a current of 0.9 amps. What is the resistance of the lamp?

122.2 ohms

A buzzer requires 150 milliamperes at 2.5 volts for operation. How much resistance does the buzzer present?

16.7 ohms

Three resistors of 10, 20, and 30 ohms are connected in series. The voltage drop across the 20 ohm resistor is 40 volts. What is the current flow?

2 amps.

If resistors of seven, four, and fourteen ohms are connected in parallel, the total resistance is:

2.15 ohms.

A parallel circuit with 20 volts applied across two branches has a total current of 5 amps. If one branch resistance equals 5 ohms; the other branch resistance equals:

20 ohms

Two resistances are connected in parallel. If each dissipates 10 watts, the total power supplied by the voltage source equals:

20 watts.

The resistance of relay coil is 150 ohms and it requires 145 ma to operate the relay. What is the lowest voltage necessary to operate the relay?

21.75 volts

What is the working resistance of a motor which produces 103.7 watts at 48 volts?

22.22 ohms

In a parallel circuit with four 6-ohm resistors across a 24 volt battery, what is the total voltage across resistor three (VR 3) in the circuit

24 volts

A 12 volt battery causes 2 amps to flow through 6 ohms. What is the power consumed by the circuit?

24 watts.

Three resistors are connected in parallel with a total potential of 6 volts. R1= 30 ohms, R2= 15 ohms, R3= 5 ohms. What is the total resistance of this circuit?

3.33 ohms

Three resistors connected in series draw a total current of 6.6 amps. R1 = 5 ohms, the voltage drop across R2 is 26 volts, and the voltage drop across R3 is 20 volts. What is the resistance value of R2?

3.939 ohms

Three resistors connected in parallel draw a total of 20 amps. R1 = 6 ohms, R2 = 12 ohms, and the voltage drop across R3 is 40 volts. What is the resistance of R3?

4 ohms

What voltage drop will appear across a 10 ohm resistor when the current through it is .5 ampere?

5 volts

The current needed to operate a soldering iron which has a rating of 600 watts at 110 volts is:

5.455 amperes.

Four resistors are connected in series and draw a total of 0.618 amps at 115 volts. R1 = 10 ohms, R2 = 25 ohms, R3 = 100 ohms, and the resistance of R4 is unknown. What is the resistance of R4?

51.084 ohms

Four resistors are connected in parallel under a total potential of 28 volts. R1 = 3.3 ohms, R2 = 2.2 ohms, R3 = 4.4 ohms and R4 = 1.1 ohms. What is the total current in the circuit?

53.03 amps

A parallel circuit with three resistors of 6 ohms, 5 ohms, and 30 ohms is connected to 30 volt source. What is the current flow through the 5 ohm resistor?

6 amps.

A 30 ohm, 60 ohm, and 150 ohm resistor are connected in series across a 24 volt battery. How much potential difference appears across the 60 ohm resistor?

6.0 volts

A current of 0.62 ampere may be expressed as:

620 milliamperes

Three resistors connected in series have a total voltage drop of 45 volts, the voltage drop across R1 is 20 volts, the resistance value of R2 is 4 ohms, and the voltage drop across R3 is 15 volts. What is the resistance value of R1?

8 ohms

Two resistors with values of 4 kilohms and 8 kilohms are connected in parallel. If the 4 kilohm resistor has 8 volts, the 8 kilohm resistor will have:

8 volts.

Which of the following procedures can be used to calculate the resistance of a load?

Divide the load voltage by the load current

A single wire system is one in which the:

Frame of the aircraft serves as one conductor.

If a parallel circuit is open in the main line, the current:

Is zero in all the branches

If a resistor is connected in parallel with a lamp:

The lamp would not be affected.

Four, fifty ohm resistors are connected in parallel. When one leg of the parallel circuit is disconnected, what happens to the total resistance?

The total resistance becomes 16.7 ohms

Three light bulbs are connected in parallel across a 120 volt power line. If one bulb opens, how many bulbs will light?

Two.