If you have a light bulb connected to a circuit and you increase the current, what happens to the light bulb and the power (assuming the voltage remains the same)?

a. the light bulb shines brighter and power decreases
b. the light bulb shines brighter and the power increases
c. the light bulb gets dimmer and the power decreases
d. the light bulb gets dimmer and the power increases

The correct answer is Option b.

Explanation:

Power is defined as the amount of work done in a given amount of time. It is also defined as the product of voltage and the current.

Mathematically,

where,

P = power

V = voltage

I = current

As, the voltage remains constant, and if we increase the current flowing through the light bulb, power will also increase because current is directly proportional to the power of the light bulb.

Increase in the power will increase the brightness of the bulb and vice-versa.

Hence, the correct answer is Option b.

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

so easy. just google the electromagnetic waves and it’ll pop up.