Explain why the bulb connected to two dry cells lights up brighter than one bulb connected to one dry cell?

because voltan yg digunakan adalah lbh tinggi.
voltage is higher when you use two dry cells. [ V=IR ] When V increases, I increases, thus brightness increases.
Komen telah dipadam


Brightness depends on the Power (P=IV).

One dry cell = 1.5V
Two dry cells = 3 V

Since the voltage is higher with two dry cells and current is the same (cuz' series circuit), hence P has a bigger value and the bulb is brighter. MORE POWER! :D