An electrical device has a resistance of 60 ohms and requires a current of 0.15 A to work properly. How many 1.5 V cells does the device require?

6

Explanation:

Given that :

Resistance (R) = 60 ohms

Required current (I) = 0.15 ampere

Voltage (V) = current (I) * Resistance (R)

V = 0.15 * 60

V = 9v

Number of 1.5V cells required by the device :

9V / 1.5V

= 6

Hence, the device requires six 1.5V cells

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