The ampere is a unit of
a. magnetism.
b. electric current.
c. electric charge.
d. temperature.

The correct answer is B) electric current.

An ampere is a unit of electric current.

We are talking about electricity. An ampere can be defined as the "unit of measure of the rate of the electron flow." The current in an electrical conductor is an ampere. A French physicist, Adree Marie Amper (1775-1836) established the amper's law of electromagnetism, during his experiments. He also proposed the existence of non-visible particles that later were known as the Electron.

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it