Question

A physical science student is studying ohm's law and builds a circuit. the supplied voltage is 210 v. how much resistance will the student need in order to have an amperage of 7.0 a?

a. 1,470 ω
b. 30 ω
c. 0.03 ω
d. 217 ω

Answer 1

To find the resistance needed for an amperage of 7.0 A with a supplied voltage of 210 V, apply Ohm's Law (R = V/I). The calculation yields a resistance of 30 ohms, which is option B.

Step-by-step explanation:

Understanding Ohm's Law

To calculate the resistance required to achieve an amperage of 7.0 A with a voltage supply of 210 V, the principle of Ohm's Law is applied. Ohm's Law is a fundamental law in physics that describes the relation between voltage (V), current (I), and resistance (R) in electrical circuits. It's given by the formula I = V/R, which can also be rearranged to solve for R: R = V/I.

By substituting the given values into the formula, we calculate the resistance needed: R = 210 V / 7.0 A. After performing the division, we find R = 30 ohms. Hence, the resistance required in the circuit to have an amperage of 7.0 A is 30 Ω, which corresponds to option B.