The central processing unit, the microprocessor that actually performs the calculations, is what takes the most power when the calculator is running.
The more calculations the machine is asked to perform, the more power it would draw.
Just being turned on would take only enough of the calculator’s battery power to light up the display.
In a battery-operated calculator, what determines the amount of energy used: the length of time it is turned on, or the complexity of the computation?
