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Why in port 0 each pin must be connected to 10k ohm pull-up resistors in 8051?
Wiki User
∙ 11y ago
Port 0 has open drain output drivers, so if you want to use it for output (or its external memory address/data bus use) the pull-ups must be provided externally.
Ports 1, 2, and 3 have built in internal pull-ups.
Check your datasheet for details.
Wiki User
∙ 11y ago
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If as more resistors are connected in series with the first what happens to the potential difference across each resistor?
adding resistors to a string will have the effect of decreasing each resistor voltage drop.
What is the rule for finding the total resistance of a number of resistors connected in series?
If the resistors are in series, then the total resistance is simply the sum of the resistances of each resistor.
You are just asking that let us assume you have connected 2 or 3 resistors in a circuit and the current flowing through the circuit and from all the resistors will be same but how?
If the resistors are connected in series, the total resistance will be the sum of the resistances of each resistor, and the current flow will be the same thru all of them. if the resistors are connected in parallel, then the current thru each resistor would depend on the resistance of that resistor, the total resistance would be the inverse of the sum of the inverses of the resistance of each resistor. Total current would depend on the voltage and the total resistance
What is a parilel circuit?
A parallel circuit is one where the elements in question are connected "side-by-side". The term is generally use to contrast against a series circuit where the elements are connected "end-to-end". As an example take two resistors and arbitrarily label the leads "A" and "B". If you connect the two resistors to each other such that A on one is connected to A on the other and B on the one is connected to B on the other, you have created a parallel connection of the two resistors.
What is the equivalent resistance when resistors are in a cube?
The equivalent resistance, from corner to corner, of 12 resistors connected in a cube is 5/6 that of a single resistor.Proof:Start from one corner and flow current through to the opposite corner. You have three resistors. Each of those three resistors is connected to two resistors, in a crisscross pattern. Those six resistors are then connected to three resistors which are connected to the other corner. By symmetry, the voltages at the upper junctions are the same, and then same can be said for the lower junction. You can then simplify the circuit by shorting out the upper junctions and (separately) the lower junctions. This means the circuit is equivalent to three resistors in parallel, in series with six resistors in parallel, in series with three resistors in parallel. This is 1/3 R plus 1/6 R plus 1/3 R, or 5/6 R.
When three resistors are connected in series the amount of voltage that is measured across each one is determine by what?
The voltage drop across each resistor is determined by the amounts of resistance in the 3 resistors and all the rest of the resistances in the electrical circuit.
What would be the total current and voltage dropped for each of the two resistors 7 and 9 ohms be if they're supply voltage is 230 volts?
Please specify whether the resistors are connected in series or in parallel.
Three 15 ohm resistors are connected in parallel to a 30 volt battery What is the current through each branch of the circuit?
2 amps
What are Relationship between the voltage drop across the resistors and the currents through the resistors when resistors are connected in parallel?
A: The relationship is that the current will divide for each paths in a parallel circuit and the voltage drop across each will be the source voltage. In a series circuit the current will remain the same for each component but the voltage will divide to reflect each different component value. And the sum of all of the voltage drops will add to the voltage source.
6 equal resistors of 1 ohm each are connected to form the sides of a hexagon ABCDEF calculate the resistance offered by the combination if the current enters at A and leaves at D?
1.5 ohms. Two 3 ohm resistors in parallel.
What is the PD across two resistors connected parallel to a battery of emf 6V?
The potential difference across two resistors connected in parallel to a battery with a potential difference of 6 volts is 6 volts. Kirchoff's Voltage Law: The signed sum of the voltage drops in a series circuit is zero. This means that that the two series circuits involving the battery and each resistor have the same voltage across each other, and the series circuit involving the two resistors have the same voltage across each other.
A 24 volt battery supplies three devices wired in parallel that each have a resistance of 9 ohms. What is the voltage drop across each device?
A simple circuit has three resistors connected in series. The resistors are 14 ohms 12 ohms and 9 ohms. What is the total resistance of the circuit?
