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Is it okay to use a power supply with higher amps?
The amperage rating on your power supply simply means that the supply can put out up to 2 amps, so as long as the voltage matches (12 volts) you could safely use a higher amp power supply for your device.
Does a resistor increase amperage?
Increasing Amperage If your circuit contains chips known as resistors, you can lower resistance and therefore increase amperage by switching out the current resistor for a one with a lower rating. By keeping the voltage exactly the same but lowering the resistance you will increase the amperage of the circuit.
Is it OK to supply more current than what the voltage is?
It does not matter if the power supply you are using to generate the supplied 5V is capable of supplying 0.05A or 5A of current; because the voltage and resistance are fixed, the current through the circuit will also be fixed.
Why are resistors placed in a circuit to reduce current?
This means that placing only an LED in series with your voltage source will result in a current that is large – probably likely much higher than the LED is rated to handle. This is the reason that a resistor is placed in the circuit – to reduce the amount of current drawn by adding some resistance to the circuit.
Why is the resistance of a shunt resistor low?
This means that the maximum current multiplied by the resistance value, cannot be higher than the voltage rating. Also, the resistance value should be as low as possible to limit the interference with the circuit. On the contrary, the resolution gets smaller the smaller the resistance and thus the voltage drop is.
When do I need a shunt resistor for an ammeter?
Most ammeters have an inbuilt resistor to measure the current. However, when the current is too high for the ammeter, a different setup is required. The solution is to place the ammeter in parallel with an accurate shunt resistor.