Question

what apply cross a bulb to cause a current flows through it​

Answer 1

Answer:

I understand that increasing voltage increases the energy given to each coulomb in the circuit, so in theory more energy given to a bulb should make a bulb glow brighter. But also if voltage is constant and resistance decreases, then current increases so that means that the bulb glows brighter too because more coulombs are flowing through it per second. But what happens if voltage and resistance are increased proportionately so that current remains the same? More energy is supplied to each coulomb so it should make the bulb grow brighter right? Or have I made some error?

Answer 2

Answer:

We have to apply potential difference across a bulb to cause a current flow through it.