Question: Why Does The Switch Have To Be Closed In Order For The Light Bulb To Light?

What is the switch when the brightness of a bulb is closed?

When the switch is closed, the light bulb operates since the current flows through the circuit.

The bulb glows at its full brightness since it receives its full 120 volts and has the design current flow (Figure 1)..

Is it bad to turn on a light without a bulb?

Similarly one may ask, is it bad to turn on a light without a bulb? No, it is not safe. Lint, dust, a moth, or flying bug could cause a spark/fire. Better to leave a bulb in the socket, or insert a plug adapter than to leave the socket open.

What are the conditions necessary to make a bulb light up?

When a light bulb connects to an electrical power supply, an electrical current flows from one metal contact to the other. As the current travels through the wires and the filament, the filament heats up to the point where it begins to emit photons, which are small packets of visible light.

Which switch or switches must be closed to make the lamp light?

Switches in Parallel Switch S1 OR Switch S2 (or both of them) must be closed to light the lamp.

Are bulbs brighter in series or parallel?

In a series circuit, the voltage is equally distributed among all of the bulbs. Bulbs in parallel are brighter than bulbs in series. In a parallel circuit the voltage for each bulb is the same as the voltage in the circuit.

Will all the bulbs be the same brightness?

If two bulbs in series aren’t identical then one bulb will be brighter than the other. Brightness depends on both current and voltage. Remember the current through both must be the same because the current is the same everywhere in a series circuit.