# What is the difference between a resistor and a light bulb?

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Resistors are components that are used to control that amount of current flowing in a circuit. The light bulb in the first circuit was actually acting like a resistor because it only allowed a certain amount of current to flow through it.

## Can a light bulb be used as a resistor?

The reason a light bulb glows is that electricity is forced through tungsten, which is a resistor. The energy is released as light and heat.

## Is a bulb a resistance?

The filament in an incandescent bulb does not have a constant resistance. If you take a bulb and increase the voltage across it, the current increases too. An increase in current means the bulb gets hot—hot enough to glow. As the temperature increases, however, the resistance also increases.

## What is resistive bulb?

resistance inductance incandescent. A lightbulb (a plain old incandescent lamp) is typically brought up as an example of resistive load. Yet the filament is actually made of several feet of very thin wire cleverly coiled to form a filament which is about one inch long.

## Does a light bulb have a constant resistance?

The light bulb filament does not have a constant resistance. The filament’s resistance changes as it heats up and cools down. … For a circuit with a constant resistance, what happens to the current as the voltage increases? For a circuit with a constant resistance, the current increases as the voltage increases.

## Why is a light bulb also called a resistor in a circuit?

Resistors are components that are used to control that amount of current flowing in a circuit. The light bulb in the first circuit was actually acting like a resistor because it only allowed a certain amount of current to flow through it.

## What does a resistor do in a circuit?

A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other uses.

## Does higher wattage mean more resistance?

Power (in Watts) is equal to the square of the Voltage divided by the resistance. … Ohm’s law says that if the voltage is constant, then there will be more current for a smaller resistance. The power law says that if the voltage is constant, then more current means more power.

## What is the resistance of a 100 watt light bulb?

The typical cold resistance of a 100 W incandescent lamp is about 9.5 ohms. If that resistance stayed the same with 120 V applied, Ohm’s Law tells us that the bulb would draw about 12.5 amps and dissipate about 1,500 watts.

## How many amps will a 60 watt light bulb use if your house is 120 volts?

In fact, the 120-Watt bulb would have a current of 1 Amp and a resistance of 120 Ω; the 60-Watt bulb would have a current of 0.5 Amp and a resistance of 240 Ω.

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## Are LED lights resistive or inductive?

“When migrating from incandescent bulbs to either CFLs or LED lighting, the load isn’t resistive anymore, it’s inductive or capacitive so the dimmer doesn’t behave the same way as it would with an incandescent bulb.” “The result is flickering when the dimmer interacts with the input of the LED drivers,” Anumula added.

## Which gas is used in LED bulb?

A mixture of six inert gases (helium, neon, argon, krypton, xenon, and nitrogen) was introduced as the filling gas of LED bulb. The optimum composition of the mixture gas existed to achieve the maximum natural convection heat transfer inside the LED bulb.

## Does the resistance of a light bulb change?

A filament lamp is a common type of light bulb. It contains a thin coil of wire called the filament. This heats up when an electric current passes through it, and produces light as a result. The resistance of a lamp increases as the temperature of its filament increases.

## How do you calculate the resistance of a light bulb?

For a given resistance, V = iR, so the bulb’s resistance (when it has 120 volts across it) is 120/(1/3), or 360 ohms. (We also know by the two equations above that P = i2R, which gives R as 40/(1/9), or 360 ohms.)

## What is the resistance of a small light bulb?

(A typical bulb has a resistance of 7 to 8 ohms through the filament and 2 to 3 ohms through the shunt once the coating burns off.) Although you can buy simple 50-bulb strands like the one shown above, it is more common to see 100- or 150-bulb strands.

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