How do you find the base current of a resistor?

This tells you the minimum amount of current required from the driver. To calculate the base resistor, subtract the B-E 0.7V from the driver voltage and divide by the base current: 4.5-0.7 = 3.8V / 400uA = ~9.5K ohms max.

How do you find the base current of a PNP transistor?

PNP Transistor Example Base current, IB = VB/ RB = 1.5/ (200*103) = 7.5uA. Emitter current, IE = VE/ RE = (10-2)/ (5*103) = 8/ (5*103) = 1.6mA.

How is hFE calculated?

The common-emitter DC gain (base-to-collector current gain, hFE) is calculated by hFE = IC/IB with VCE at a constant voltage. hFE is also called βF, the forward DC current gain. It is often simply written as β, and is usually in the range of 10 to 500 (most often near 100). hFE is affected by temperature and current.

What is base current?

Base current is like base voltage. Base current is calculated using base kVA/MVA and base voltage. These are used as a reference to Cal. the per unit quantity (current, voltage) and thereby per unit impedance values. These per unit values are used in power system fault analysis mainly in Cal.

How do you calculate IB and IC?

IB = IB0 exp (VBE/Vt) and IC = β IB0 exp (VBE/Vt) where Is is the saturation current that depends on the devices parameters including the base width and doping.

What is base resistor?

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.

How do you calculate base voltage?

This can be done using the formula: Vcc = Vrc + Vrb + Vbe + (Ic + Ib)Rc + IbRb + Vbe, where “Vrc” is the voltage across the collector resistor; “Vrb” is the voltage across the base resistor (connected across the base) and the junction between the collector resistor and the transistor collector; and “Vbe” is the voltage …

What is the unit of hFE?

hFE is an abbreviation, and it stands for “Hybrid parameter forward current gain, common emitter”, and is a measure of the DC gain of a junction transistor. So on a multimeter, it indicates a mode where the meter can measure (probably crudely), the HFE of a transistor.

What is hFE range?

The hFE is normally seen to be a constant value, normally around 10 to 500, but it may change slightly with temperature and with changes in collector-to-emitter voltage.

How is base current formed?

It is true that electrons and holes combine in the base region, however the holes lost due to recombination are compensated by sending electrons in the opposite direction by the external power supply connected between the base and the emitter, as a result a conventional current ie the base current is generated due to …