Why do transistors need a resistor?

The resistors are used as a means of generating voltage drops and thereby pulling the transistor into the desired operating region. because you need to limit the current to semiconductor terminals. otherwise, the transistors will be damaged.

What does a resistor do to a transistor?

A base resistor limits the current flowing into the base of the transistor to prevent it being damaged but it must also allow sufficient base current to flow to ensure that the transistor is fully saturated when switched on.

Why do you need resistor at base of the transistor?

“base” resistor, so called because it limits the amount of current that flows through the base of the transistor.

Why is resistor used in a transistor as a switch?

When maximum Collector current flows the transistor is said to be Saturated. The value of the Base resistor determines how much input voltage is required and corresponding Base current to switch the transistor fully “ON”.

Why is the resistor necessary?

They may be small and often built-in to other components, but resistors are essential to almost every electrical circuit. These hidden resistors are essential because they control the flow of the electrical current to sensitive components, and they protect components from voltage spikes.

Transistors Explained - How transistors work

What happens if there is no resistor in a circuit?

If there really were no resistance in the circuit, the electrons would go around the circuit, and arrive back at the beginning of the circuit with as much energy as the potential difference (the voltage). That final energy is usually what is dissipated as heat or other types of energy by the circuit.

What is the purpose of a resistor in electronics?

A transistor basically needs a small base voltage (>0.6) to make a large voltage flow through its collector/ emitter terminals. But the base of a transistor is quite vulnerable to high currents, so a resistor is incorporated here to limit the current and provide a safe biasing voltage.

How do transistors amplify current?

A transistor acts as an amplifier by raising the strength of a weak signal. The DC bias voltage applied to the emitter base junction, makes it remain in forward biased condition. This forward bias is maintained regardless of the polarity of the signal.

Does transistor work on AC or DC?

A transistor audio amplifier for example is an AC signal amplifier, since the microphone generally generates an AC output. And here is a point that many people confuse: Transistors are NOT AC components: Transistors can only operate with DC signals!

Why transistor is called as a switch explain?

The transistor operates as a Single Pole Single Throw (SPST) solid state switch. When a zero input signal applied to the base of the transistor, it acts as an open switch. If a positive signal applied at the input terminal then it acts like a closed switch.

Do I need a resistor before a transistor?

The resistors are used as a means of generating voltage drops and thereby pulling the transistor into the desired operating region. because you need to limit the current to semiconductor terminals. otherwise, the transistors will be damaged.

Are transistors resistive?

A transistor is like a resistor, except that the resistor can be controlled by a second input called base input; It should also be noted that the gate input of the transistors is the transmitter and the output is the collector (its backward reason).

Can a transistor pass AC?

No, as you said a transistor acts like a diode when it is "on" but as a subsitute you could either use a triac for low current applications or a solid state relay for higher current applications.

Can transistor amplify DC voltage?

Yes, transistors amplify DC. However, DC can only be amplified by BJT and not a FET. The input DC is amplified to the base, and this amplified current is extracted by at the collector.

Can AC flow through a transistor?

If this is what you mean, the answer is yes. Small signal ac is what a transistor designed to do. Small signal ac means a transistor is operating with relatively small changes around its operating point where the operation can be considered linear. This is typically the case of an amplifier.

How does a transistor control current?

By turning a small input current into a large output current, the transistor acts like an amplifier. But it also acts like a switch at the same time. When there is no current to the base, little or no current flows between the collector and the emitter. Turn on the base current and a big current flows.

How does current flow in a transistor?

Current freely flows from collector to emitter. Cut-off -- The transistor acts like an open circuit. No current flows from collector to emitter. Active -- The current from collector to emitter is proportional to the current flowing into the base.

Do transistors amplify voltage or current?

a transistor can amplify the current and it can amplify the voltage and it can do both at the same time. a transistor can also amplify the voltage is seen on the base. this is done in transmitter common mode where the transmitter is connected to the 0v rail and the collector has a load resistor.

Do resistors reduce voltage?

Voltage varies directly with current. "R" is the constant of proportionality telling how much it varies. If I add in a resistor to a circuit, the voltage decreases. If you have a resistor in a circuit, with a current flowing through it, there will be a voltage dropped across the resistor (as given by Ohm's law).

Does a resistor reduce current?

The resistor reduces the current, just like the narrow pipe reduces the flow rate. The current before and after the resistor is the same, just like the flow rate before and after the narrow pipe is the same.

What is the function of resistor and capacitor?

A resistor is an electronic component used to resist the flow of current in a circuit. It's more like a friction which restricts energy. A capacitor, on the other hand, is an electronic component used to store electrical charge. It generally opposes changes in current in electrical and electronic circuits.

Is infinite current possible?

In a superconductor, the current can keep flowing "forever" since there is no resistance. But since conductors have inductance (in fact, superconductors are used most often to create magnets like for an MRI scanner), applying a voltage would not (immediately) cause an infinite current to flow.

What happens if you remove a resistor?

Since the equivalent resistance is the sum of the resistance of the individual resistors, any decrease of resistance or removal of a resistor will lead to a decrease in the equivalent resistance.

Is a light bulb 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. A conductor is the opposite of a resistor.

What is Q point in transistor?

The operating point of a device, also known as a bias point, quiescent point or Q-point, is the steady-state DC voltage or current at a specified terminal of an active device such as a transistor with no input signal applied.