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What else can I help you with?
How does a bulb glow when a torch is switched on?
If your torch has an incandescent bulb in it, the resistance of the wire in the bulb generates enough heat that light is created. If your torch has an LED bulb, the PN junction in the diode creates light when the diode is forward-biased.
Is a torch connected in series or parallel?
A torch typically has its battery connected in series with the light bulb, creating a simple circuit. This means the electrical current flows from the battery through the bulb and back to the battery in a continuous loop, allowing the light to work.
Why is a graph of voltage against current for a filament bulb curved?
Because as current increases, heat increases and therefore resistance increases. Since resistance is the gradient of the graph, the gradient will increase and therefore the graph will curve. (The filament in the bulb is an non-ohmic conductor; its resistance is only constant at a constant temperature.)Another AnswerIncandescent lamp filaments are manufactured from tungsten. Tungsten is classified as 'non-ohmic' or 'non-linear', which means that (in common with most materials, in fact) it does not obey Ohm's Law. For a material to obey Ohm's Law, the ratio of voltage to current (i.e. its resistance) must remain constant for variations in voltage -as you have discovered, tungsten doesn't do this, producing a curve, rather than a linear, graph. As the original answer indicates, the temperature coefficient of resistance of tungsten in such that, as it gets warmer, its resistance increases.Those few materials that do obey Ohm's Law are called 'ohmic' or 'linear' materials.
What is an example of a circuit that doesnt obey Ohms Law?
The easiest circuit that does not obey Ohm's law is a circuit that has a resistance that depends on temperature. For example, if you take a light bulb and draw a current-vs-voltage, you see that in the beginning (under low voltage) the graph is NOT a straight line, but under high voltage the graph is linear. This is because the resistance depends on temperature. the equation V=IR isn't consistent with the graph's shape.
What thing besides a torch can you make with one small bulb and three batteries?
you can make a torch bulb
How is energy transferred from the battery to the bulb of a torch or flashlight?
Energy is transferred from the battery to the bulb of a torch or flashlight through a closed circuit. When the battery is connected to the bulb, it provides electrical energy to the filament in the bulb, which then converts the electrical energy into light energy through the process of electrical resistance. This light energy is what produces the glow in the bulb.
What is the job of the cells and wires and bulb and switch in a torch?
The job of a bulb is to give off heat and light energy
Which has the thickest filament - a high-resistance or a low-resistance bulb?
A high-resistance bulb typically has a thicker filament compared to a low-resistance bulb. The thicker filament in a high-resistance bulb can withstand the greater heat generated by the increased resistance, resulting in a longer lifespan for the bulb.
What materials are conductors in a torch?
The conducting path of a torch is a simple circuit: Battery to switch, switch to bulb, bulb back to battery. Provided the switch is on, and there are no breaks in the circuit wiring (and the bulb is good), the torch should work.
A torch is operated by a 3v battery when the switch is closed the bulb draws 0.075 amps from the battery what is the resistance of the bulb?
V=IR R=V/I V=3V I=0.075A R=3/0.075 = 40 ohms
How is energy transferred in a torch from the battery to the bulb - is it by electricity - is it by light - is it by sound - is it by thermal energy?
Energy is transferred in a torch from the battery to the bulb primarily by electricity. The battery provides an electrical current that flows through the circuit inside the torch, ultimately powering the bulb to produce light. Some energy may be lost as thermal energy due to resistance in the circuit, but the main transfer mechanism is through electricity.
Why is there glass on the end of a torch?
It is there to protect the bulb.
