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# as more resistors are added in parallel across a constant voltage source, the power supplied by the source

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## As more resistors are added in parallel across a constant voltage source, the power supplied by the

As more resistors are added in parallel across a constant voltage source the power will; increaseFormula for Poweer across a circuit with constant voltage is;P … 05/08/2019 Physics High School

As more resistors are added in parallel across a constant voltage source, the power supplied by the source as more resistors are added in parallel across a constant voltage source, the power supplied by the source increases for a time and then starts to decrease. increases. decreases. does not change. As more resistors are added in parallel across a constant voltage source the power will; increase

Formula for Poweer across a circuit with constant voltage is;

P = I²R Where; P is Power I is current R is resistance

Now, when resistors are connected in parallel, the total resistance is usually;

1/R = 1/R1 + 1/R2 + 1/R3....

Where R is total resistance.

This means that the more resistors you add in parallel, the greater the value of R.

Thus, from the Power equation, when R increases, then P will also increase.

Still stuck?

1.0 (1 vote)

increases

Explanation:

In a circuit, the power supplied by the source is given by:

(1)

where V is the voltage of the source and I is the current in the circuit.

Using Ohm's law, we can rewrite the current as:

where R is the equivalent resistance of the circuit. Substituting into (1), we can rewrite the power as

(2)

so we see that the power is inversely proportional to the resistance.

For resistors added in parallel, the equivalent resistance is given by the formula

so we see that when adding new resistors in parallel, the term increases, so the equivalent resistance R will decreases. As a result, the power supplied by the source (given by eq.(2)) wil increase.

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## Unit 11 Week 2 Quiz Flashcards

Study with Quizlet and memorize flashcards terms like A short piece of metal that melts when a large current passes through it is a:, Three identical resistors are connected in series to a battery. If the current of 12 A flows from the battery, how much current flows through any one of the resistors?, In a series circuit, each circuit element has the same: and more.

## Unit 11 Week 2 Quiz

32 studiers in the last day

A short piece of metal that melts when a large current passes through it is a:

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fuse

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Three identical resistors are connected in series to a battery. If the current of 12 A flows from the battery, how much current flows through any one of the resistors?

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12 A

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### Textbook solutions for this set

Fundamentals of Electric Circuits

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### Terms in this set (40)

A short piece of metal that melts when a large current passes through it is a:

fuse

Three identical resistors are connected in series to a battery. If the current of 12 A flows from the battery, how much current flows through any one of the resistors?

12 A

In a series circuit, each circuit element has the same:

current

Heat a copper wire and its electric resistance

increases

Which set of information will allow you to calculate the kilowatt x hr usage?

the resistance, the current, and the time the circuit operates

As more resistors are added in series to a constant voltage source, the power supplied by the source

decreases

As more resistors are added in parallel to a constant voltage source, the power supplied by the source

increases

The ratio of the potential difference across a metallic conductor to the current in the conductor is known as

resistance

On some early automobiles both headlights went out when one bulb burned out. The headlights must have been connected in

series

The lamps in a string of Christmas tree lights are connected in parallel. What happens if one lamp burns out?

The brightness of the lamps will not change appreciably

In an electric circuit, the safety fuse is connected to the circuit in

series

An automatic switch that opens when the current reaches a set value is called:

circuit breaker

Three identical resistors are connected in parallel to a battery. If the current of 12 A flows from the battery, how much current flows through any one of the resistors?

4 A

In an AC circuit, the electric field

changes magnitude and direction with time.

A circuit has a continuous path through which charge can flow from a voltage source to a device that uses electrical energy. What is the name of this type of circuit?

a closed circuit

When two or more resistors are connected in parallel to a battery,

the voltage across each resistor is the same, the total current flowing from the battery equals the sum of the currents flowing through each resistor, and the equivalent resistance of the combination is less than the resistance of any one of the resistors.

Which of the following wires would have the least resistance, assuming that all of the wires have the same cross-sectional area?

a copper wire 5 cm in length

Electrons are made to flow in a wire when there is

a potential difference across its ends

Three resistors with values of R1, R2, and R3 are connected in series. What is an expression for the total resistance, Req, of the three resistors?

Req = R1 + R2 + R3

A circuit is powered with a battery. Charge flows

through both the battery and the rest of the circuit.

Which statement is correct?

Charge flows in a closed circuit.

When two or more resistors are connected in series to a battery

the same current flows through each resistor, the equivalent resistance of the combination is equal to the sum of the resistances of each resistor, and the total voltage across the combination is the algebraic sum of the voltages across the individual resistors.

An ampere is a unit of electrical

current

Three resistors connected in parallel carry currents labeled I1, I2, I3. What is an expression for the total current It in the combined system?

It = I1 + I2 + I3

The primary source of electrons in an ordinary electrical circuit is

the electrical circuit itself

Electrons move in an electrical circuit

by interacting with an established electric field

If a resistor is added to a series circuit, the equivalent resistance:

increases

A circuit breaker often serves the same purpose as a

fuse

The number of current paths in a series circuit is:

one

When resistors are connected in parallel, we can be certain that

the potential difference across each is the same

If a resistor is added to a parallel circuit, the equivalent resistance:

decreases

Which of the following does not affect a material's resistance?

Ohm's law

The source of electrons lighting an incandescent AC light bulb is

atoms in the light bulb filament

Stretch a copper wire so that it is thinner and the resistance between its ends

increases

When we say an appliance "uses up electricity," we really are saying that

electron kinetic energy is changed into heat.

Three identical resistors are connected in series to a 12-V battery. What is the voltage across any one of the resistors?

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