0
1. PIC16F877A
2. CT
3.difference amplifier
DIFFERENCE AMPLIFIER:
To measure this current with pic microcontroller,we have to use ADC module of PIC microcontroller.To use ADC module we will convert current into voltage form by using a .1 ohm shunt resistor across CT and we will measure this voltage drop across shunt resistor.Then this voltage drop can be easily converted into current again.For example
voltage drop across .1 ohm shunt resistor =8v
then current according to ohm law
V=IR
I=V/R
I=8/.1=8A
but the problem is ADC of pic microcontroller can never measure voltage greater than 5 volt. so to solve this problem we can use differenceamplifier. By adjusting gain of difference amplifier we can reduce voltage lower than 5 volts.
Add your answer:
Earn +20 pts
How can you block ac current?
You can block AC current by using a filter with a pass-band that is outside the frequency of the AC current.
But in DC ciruit there is no current when capacitor is connected?
This is because when you introduce a capacitor, the circuit is no longer a DC circuit. If you're using a multimeter see if there is an AC setting to measure the current.
How a multimeter be connected in order to measure resistance?
A: A multimeter is an instrument design to measure ohms volts and amps. So to measure amps a shunt is provided to allow a sample of the current to be measured as a function of voltage.
How do you measure current - both magnitude and phase in ac circuit with reactive elements?
This is most easily done using an oscilloscope with a current probe. Also phase angle must be measured relative to something else, usually the AC voltage at one end or the other of the branch of the circuit where the current is being measured.
What is the significance of using inductor in ac circuit?
Current filtering
How can you measure ac?
You can measure AC (alternating current) using a multimeter set to the AC voltage measurement function. Make sure to connect the probes properly to the AC source or circuit you want to measure. The multimeter will display the AC voltage in volts.
How can you block ac current?
You can block AC current by using a filter with a pass-band that is outside the frequency of the AC current.
How do you increace voltage?
With Alternating Current (AC) voltage may be increased by using a transformer with a primary coil that has fewer turns than its secondary coil.With Direct Current (DC) an inverter is required which takes a DC signal at one voltage and uses a microcontroller to chop the signal into AC generally in the form of a square wave. The AC is then used to step-up to the voltage needed and then rectified back to DC again. This is also known as a Switch Mode Power Supply, since the DC is made into AC by means of the "switching" done by the microcontroller.
How do you measure alternative current using ac ammeter?
I think you mean 'alternating' current ('alternative' means choice). The ammeter must be inserted in series with the load, just as with direct current.
But in DC ciruit there is no current when capacitor is connected?
This is because when you introduce a capacitor, the circuit is no longer a DC circuit. If you're using a multimeter see if there is an AC setting to measure the current.
What instrument used to measure alternating current?
A multimeter has the ability to measure both AC and DC current along with voltage and resistance.
4Ub.Which instruments can measure AC current in electric circuit?
ammeter
What is perhaps the single most important advantage of using AC compared to dc current?
AC current can be transmitted with less loss
Is it possible to get a battery to produce ac current?
No. Batteries can only produce dc current which can further be converted to AC using inverters.
How a multimeter be connected in order to measure resistance?
A: A multimeter is an instrument design to measure ohms volts and amps. So to measure amps a shunt is provided to allow a sample of the current to be measured as a function of voltage.
What are the three main function of the multimeter?
A typical multimeter can measure: * AC & DC voltage (volt) * AC & DC current (amp) * resistance (ohm)
What dmv setting is used to measure power supply output voltage?
Dc V if you are measuring direct current. Ac V setting if measuring AC voltage. Recommend using a meter that's AUTO Ranging.
