# Why is there more electrical energy going into the bulb than light energy coming out of the bulb?

Contents

## Does more current flow into a light bulb than out of it?

Since the bulb has a high resistance some of the kinetic energy of the electrons changes into heat and light. Therefore the electrons coming out of the bulb should have less energy than electrons that enter the bulb.In other words the current in the wire on one side of the bulb is more than that of the other side.

## Is the current flowing into a light bulb greater than or less than the current leaving the light bulb?

The current flowing into the light bulb is the more than the current flowing out of the lightbulb. A one mile copper wire has a resitance of 10 ohms.

## Why do light bulbs use different amounts of energy?

The three bulbs in the display each have a light output of 400 lumens, but they require different amounts of power. … The energy of each collision vibrates the atoms and heats them up, eventually producing light. Only 10% of the energy used by an incandescent bulb is converted to light; the other 90% is lost as heat.

## What happens to electricity as it goes through a light bulb?

Think about a light bulb. When current passes through the wires inside the bulb, electrical energy changes into heat energy and light energy. … All parts of a circuit must be connected in order for current to flow through the circuit.

## Is the current flowing into the bulb the same as the current flowing out of the bulb?

Incandescent light bulbs have a small filament which when heated begins to glow and emit light. … The light bulb is not doing anything to the electrons, so we expect then that any electrons going into the bulb should come out the other side. Since current is just flowing electrons, current stays the same.

## What happens when a current flows through a light bulb causing the bulb to produce light?

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.

## How does the current before a bulb compare to the current after the bulb?

Since the current must leave, then it next reaches the second light bulb, where the same story is true- the current is the same on both sides of the bulb. … You are right that something changes in your circuit across the light bulb though—the voltage on either side of the light bulb is not the same.

## Why is current opposite to electron flow?

Electrons being negatively charged flow from the negative terminal to the positive terminal of the voltage source. So, the actual direction of current should be from negative to positive terminal. … So, the current flow is considered in the direction opposite to the direction of flow of electrons.

## How much energy does a light bulb use?

“A 60-watt incandescent bulb uses 60 watts of energy; we bill for energy in kilowatt hours which is 1,000 watts continuously for 1 hour. So, a 60-watt bulb uses 60 watts hours or . 06 kilowatt hours of energy for each hour it’s on.