The power in an electrical circuit is given by the equation p = i2r, where i is the current flowing through the circuit and r is the resistance of the circuit.

i. what is the power in a circuit that has a current of 12 a and a resistance of 100 ω? (note: 1 a2·ω = 1 w)

ii. what is the current in a circuit that has a power of 200 w and a resistance of 150 ω?

in physics zero. in muscle fatigue could be high

answer: a. same unit

explanation:

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.