What emf is required to cause 12 amperes to flow through a resistance of 7.2 ohms?

V = I*R (Ohm's law)

V = 86.4 Volts

To determine the required electromotive force (EMF), we can use Ohm's Law, which states that the current (I) flowing through a resistor is directly proportional to the potential difference (voltage) across it.

Ohm's Law equation is: V = I * R

Where:
V is the potential difference (voltage)
I is the current
R is the resistance

In this case, we are given the current (I = 12 amperes) and resistance (R = 7.2 ohms) and we need to find the potential difference (V).

Rearranging the equation to solve for V, we get: V = I * R

Plugging in the given values, we have: V = 12 A * 7.2 Ω

Calculating this, we find that the potential difference required (EMF) to cause 12 amperes to flow through a resistance of 7.2 ohms is:

V = 86.4 volts