What determines output voltage?
The output voltage equals the input voltage scaled by a ratio of resistors: the bottom resistor divided by the sum of the resistors.
What is the role of resistor in output circuit?
A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other uses.
Does a resistor limit current or voltage?
In short: Resistors limit the flow of electrons, reducing current. Voltage comes about by the potential energy difference across the resistor. The mathematical answer is that a resistor is a two-terminal electric device which obeys, or you could say enforces, Ohm’s law: V=IR.
What is the purpose of a voltage in a circuit?
Voltage is the pressure from an electrical circuit’s power source that pushes charged electrons (current) through a conducting loop, enabling them to do work such as illuminating a light.
How does a resistor reduce the current in a circuit?
The main function of a resistor is to limit current flow. Ohm’s law tells us that an increase in a resistors value will see a decrease in current. To reduce voltage, resistors are set up in a configuration known as ‘voltage divider’. Also, with every component in a circuit, the resistor drops voltage across its terminals.
Why does a resistor only drop one volt?
Actually, the resistor produces a drop in potential (that is, potential energy per unit charge). If one resistor only drops one volt from the original voltage (only drops one volt because of its resistance value) and we add another resistor in series with the same value, then that second resistor would also drop one volt.
How much voltage is consumed by each resistor?
Since the total current has changed, we need to recalculate our the amount of voltage consumed by each resistor. For each resistor (since they have identical resistance values), the total voltage drop is now 6V (V = I * R = 1 * 6 = 6). Since there are two resistors, the total voltage drop is 12V, which is equivalent to the supplied voltage.
Can a voltage divider use a variable resistor?
Voltage dividers use resistors of fixed value to adjust the output voltage. However, if a variable resistor is used at R2, the output voltage can be varied by adjusting the variable resistor. A great application for this is volume control in a music system.