Why a voltage is always connected in parallel?

Answer 1

Because Voltmeter measures potential difference BETWEEN two points so it should be connected to these two points and the only way for circuit and voltmeter to be both connected to the same 2 points is in parallel. Ampermeters measure the current THROUGH some circuit so the same current that is flowing through this circuit should flow through the ampermeter too. The only way is to let the current going through the circuit to go through the ampermeter later or before, so you have to connect ampermeter in series with your circuit. The fact that voltmeters have high resistance while ampermeters have low resistance is the side effect of the way how they are connected to reduce the error introduced by devices into measured value.

Answer 2

Nothing about a series circuit is necessarily constant.

You may be thinking of the current, which is the same number at any point in a series circuit.

That doesn't mean that it can't change. But if it does change, it'll change at every point, and

still be the same number everywhere in the series circuit.

Answer 3

In a parallel circuit, two or more loads are connected across a voltage. As the voltage is common to all loads, they will each have the same potential difference across them. The current through each load will vary according to the resistance of the load. Note that adding or removing one of the loads does not alter the voltage across the remaining loads, nor does it alter the currents through each of the remaining loads. It does vary the total current.

This is different to a series circuit where two or more resistors are connected one after the other. In this case, the current through each one is identical. The voltage across each of the resistors will vary depending on the value of the resistor. The higher the resistance, the higher the voltage across that resistor. As a resistor reduces in value, so the voltage across that resistor will also reduce. Note that the total voltage across all resistors will be equal to the voltage supplied.

Answer 4

Voltage stays the same in a parallel circuit, because each load has a direct connection to the power source. With no other loads (other than the resistance of the conductor) between the source and the loads, there is no voltage drop.

Answer 5

The Capacitor is connected in parallel in order to provide a discharge path for the voltages connected across the circuit.