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Why do we measure voltage instead of current?
If there is no current flowing through the line resistance, there is no voltage drop (losses) across the line and the end voltage is (almost) equal to the input voltage. Voltage controlled analog circuitry is easier to control in terms of bandwidth, has a lower power consumption and circuit design is more flexible.
Can you reduce current?
Lowering amperage is done by applying Ohm’s law, given by the formula I = V/R, where I is the circuit’s total current in amperes, V is the voltage and R is the resistance. Add resistors to the circuit to increase the total resistance. Reduce the voltage in your circuit to lower the amperage.
What happens to current when you decrease voltage?
In a linear circuit of fixed resistance, if we increase the voltage, the current goes up, and similarly, if we decrease the voltage, the current goes down. This means that if the voltage is high the current is high, and if the voltage is low the current is low.
Is it possible to increase voltage and decrease current?
The point is that power is the product of voltage and current. To transmit the same power to a consumer load, you can increase the voltage and decrease the current. If the light in your house needs 100W, say 10A at 10V, this can be transferred from the power plant directly.
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 the voltage rise as the coating builds?
Because the amperage is fixed, the voltage is free to rise to whatever level is required to overcome the resistance to current flow as the coating builds up.
A transformer works because of watt’s law: power is constant (resistance is constant in ohm’s law) and power is current x voltage, or “P = EI” A change in voltage is an inverse change in current, and vice versa, where power is conserved.