Question

The current through a device is 0.30 A, and the resistance in the device is 30 Ω. How many 1.5 V batteries are required to run the device?8426

Answer 1

First, we have to find the number of volts requires using Ohm's Law.

$V=I\cdot R$

Where I = 0.30 A and R = 30 ohms. Let's replace these values and solve for V

$V=0.30\cdot30=9V$

Once we have the amount of voltage, we can divide it by 1.5V to get the number of batteries

$n=\frac{9V}{1.5V}=6$

Therefore, there are required 6 batteries of 1.5V each.