What is the resistance of a circuit with a current of 48 amps and a voltage of 12 volts? a: 0.25 ohms
b: 60 ohms
c: 4 ohms
d: 576 ohms

a: 0.25 ohms

Explanation:

The resistance of the circuit can be calculated by using Ohm's Law:

where,

R = Resistance of the circuit = ?

V = Voltage = 12 volts

I = Current = 48 A

Therefore,

Hence, the correct option is:

a: 0.25 ohms

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:

d. platinum would have the greatest temperature increase because it has the lowest specific heat.