- Why is resistance smaller in parallel?
- Why current source is connected in parallel?
- Do current sources have resistance?
- Why the zener diode is heavily doped?
- Can you add two current sources in parallel?
- Can you put 2 Zener diodes in series?
- What makes the charges flow in a circuit?
- Do resistors in parallel add?
- Is Zener diode a rectifier?
- What is Zener effect and Avalanche effect?
- What happens when you put two resistors in parallel?
- Why two diodes Cannot be connected back to back?
- What happens when zener diode is connected in series?
- What happens when two diodes are connected in series?
Why is resistance smaller in parallel?
Adding more resistors in parallel is equivalent to providing more branches through which charge can flow.
Even though the added branches offer resistance to the flow of charge, the overall resistance decreases due to the fact that there are additional pathways available for charge flow..
Why current source is connected in parallel?
When resistors are connected in parallel, more current flows from the source than would flow for any of them individually, so the total resistance is lower. Each resistor in parallel has the same full voltage of the source applied to it, but divide the total current amongst them.
Do current sources have resistance?
The internal resistance of an ideal current source is infinite. … The voltage across an ideal current source is completely determined by the circuit it is connected to. When connected to a short circuit, there is zero voltage and thus zero power delivered.
Why the zener diode is heavily doped?
Zener diode is heavily doped than the normal p-n junction diode. Hence, it has very thin depletion region. … When the Reverse bias voltage reaches the breakdown voltage in normal PN junction diode, the current through the junction and the power dissipated at the junction are relatively high.
Can you add two current sources in parallel?
Connecting two or more current sources in parallel is equivalent to one current source whose total current output is given as the algebraic addition of the individual source currents.
Can you put 2 Zener diodes in series?
Yes, it is possible to connect multiple Zener diodes in series in order to obtain a desired Zener voltage, but in this case, care should be exercised as to Zener current, Iz. For series-connected Zener diodes, the maximum allowable Zener current becomes equal to the lowest one among their specifications.
What makes the charges flow in a circuit?
WHAT MAKES CURRENT FLOW IN A CIRCUIT? When a wire is connected to battery terminals, electrons flow from negative to positive. Unlike (opposite) charges attract, like (same) charges repel. Electrons have a negative charge—they are repelled from the negative and attracted to the positive.
Do resistors in parallel add?
Adding more parallel resistances to the paths causes the total resistance in the circuit to decrease. As you add more and more branches to the circuit the total current will increase because Ohm’s Law states that the lower the resistance, the higher the current.
Is Zener diode a rectifier?
Zener diodes are mostly used for regulating voltages. However, yes, they can be used for rectifiers. Above it’s threshold voltage(Zener voltage), the Zener diode allows reverse flow of current.
What is Zener effect and Avalanche effect?
The Zener effect is distinct from avalanche breakdown. … The avalanche breakdown occurs in lightly doped junctions, which produce a wider depletion region. Temperature increase in the junction increases the contribution of the Zener effect to breakdown, and decreases the contribution of the avalanche effect.
What happens when you put two resistors in parallel?
In other words the currents in the branches of a parallel circuit add up to the supply current. When resistors are connected in parallel, they have the same potential difference across them. Resistors in a series – In series circuits, the resistor with the greatest resistance has the greatest voltage drop.
Why two diodes Cannot be connected back to back?
This doesn’t work because base region is wide and are equally doped, whereas in actual transistor base is very thin and lightly doped. In two discrete diodes connected back-to-back, has 4 doped regions instead of 3. … Hence, two diodes connected back-to-back can never be used as a transistor.
What happens when zener diode is connected in series?
Technically the zener diode is really only usable in series. It limits, to some extent, the voltage across it, so it needs something in series to drop voltage across (Ex: resistor, current source, etc). … A 12V Zener will drop the voltage to TTL levels and provide some headroom. A Series resistor will limit the current.
What happens when two diodes are connected in series?
Diodes are connected together in series to provide a constant DC voltage across the diode combination. The output voltage across the diodes remains constant in spite of changes in the load current drawn from the series combination or changes in the DC power supply voltage that feeds them.