Mod 3 Unit2

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

is zero in all the branches

Three resistors are connected in parallel. They hovels of 2 kilohm, 4 kilohm, & 8 kilohms. Total resistance is:

less than two Kilohms

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

two

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

0.4 volts

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

0.5 amperes

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

0.5 amperes.

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

1 Ohm

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

1 amp

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

1 ohm

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

1.6 amps

How many 50 ohm resistors, connected in 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 lamp has a source voltage of 110 volts & a current of 0.9 amps. what is the resistance of the lamp?

122.2 ohms

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

12volts

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, & 30ohms are connected in series. The voltage drop across the 20ohms resistor is 40volts. What is the current flow ?

2 amps

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

2.15ohms

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

20 ohms.

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

20watts

The resistance of relay coil is 150 ohms & 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

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

24 watts.

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

51.084 ohms

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

3.33 ohms

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

3.939 ohms.

Three resistors connected in parallel draw a total of 20 amps. R1=6ohms, R2=12ohms, & 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.

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

53.03 amps

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

6 amps

A current of 0.62 ampere may be expressed as:

620 milliamperes

3 resistors connected in series have a total voltage drop of 45v's, voltage drop across R1 is 20 volts, the resistance value of r2 is 4ohms, & the voltage drop across R3 is 15 volts. Resistance value for R1?

8 Ohms

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

8 volts

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

Dive the load voltage by the load current.

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.

A single wire system is one in which the:

Frame of the aircraft serves as one conductor.

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

Go out also.

Four, 100 ohm resistors are connected in parallel. When two legs of the parallel circuit are disconnected, what will happen to the total resistance ?

Increases

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

Less than 100ohms

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

One

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

Remain as it was

If a resistor is connected in parallel with a lamp:

The lamp would not be affected.

In a D-C parallel circuit:

The sum of the branch currents equals the total current.

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

The total resistance becomes 16.7

With two resistances connected in parallel:

The voltage across each resistor must be the same.

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

an ohmmeter