Physics, 05.11.2020 04:50 130005401

A circuit consists of a wire, two lightbulbs, a switch, and a battery. What would happen if one of the lightbulbs were replaced with a section of wire?
A. The circuit would have more resistance.
B. The circuit would have less resistance.
C. The circuit would have less voltage,
D. The circuit would have more voltage.

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Answer from: jacksonshalika

B. The circuit would have less resistance.

Explanation:

When the lightbulb is replaced in the circuit by a wire, the circuit will have less resistance.

Resistance is the the opposition to the flow of current within a circuit. Both a light bulb and wire are two examples of resistors in a circuit.

A wire has a low value of resistance compared to the bulb. This is why the overall resistance will reduce when a light bulb is replaced with a wire.

Answer from: Quest

Ibelieve the correct answer would be c.

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

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A circuit consists of a wire, two lightbulbs, a switch, and a battery. What would happen if one of...

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