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What would happen if ammeter were connected directly across a voltage source?
Wiki User
∙ 13y ago
An ammeter measures current by either being inserted in series with the load being measured or using a clamp-on device that induces a proportional current that the meter measures. Nothing should happen if you connect an ammeter across a voltage source unless it was very high voltage compared to the rating of the meter.
Wiki User
∙ 13y ago
Wiki User
∙ 13y agoUnless you set the voltmeter to a reading scale equal to or above the supply, you will at the very least blow the meter's fuse(s), and at worst - only too common - destroy the meter.
Info for digital multimeters:
If you are using a multimeter to just measure the voltage from your power supply, then you can connect it directly to the + and - of any of the rails. (it wont harm the multimeter or the power supply)
PS you can monitor your voltages while the PC is in use. Great for diagnosing problems such as a bad power supply causing a PC to suddenly reboot as if the reset button was pressed (with a multimeter you may notice a sudden drop for for a split second on one of the rails)
If you choose to measure the amperage, do not connect the multimeter directly to the rails in the power supply (it instead has to be connected inline of another circuit or it will fry the multimeter).
Wiki User
∙ 14y agoThe meter would display a very high value of current, for a very short time, until either the meter movement or the series fuse burned open.
Wiki User
∙ 13y agoYou will read the voltage drop across the resistor.
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How should a ammeter and voltmeter be connected in series?
no. you want to measure across the desired circuit segment. whether you are measuring voltage drop or current.
How does an ammeter work?
An ammeter is a low voltage voltmeter in parallel with a small resistance resistor. Current flow through the resistor creates a voltage drop across it which is then measured by the voltmeter.
How do you connect more than one ammeter to a circuit?
Two ways to connect an ammeter, You can use a direct reading type, by connecting the ammeter in series with the load. You can use a current transformer type or CT. The current transformer looks like a wire wrapped donut with two terminals on its side with a hole through the middle. you pass the wire carrying the load through the center. Connect the direct reading meter to the two terminals. A CT type meter allows you to measure higher currents.
In a circuit the voltage across all resistores is the same?
It depends upon the connection of the resistors, if the resistors are connected in parallel then the voltage is same where as in case of resistors connected in series the voltage is different across different resistors.
The voltage measured directly across an open switch in a circuit will be?
The voltage measured across an open in a series circuit is the equivalent of the sourse voltage.
How do you connect an ammeter and voltmeter?
The voltmeter is connected across the supply and the ammeter is connected in series with the supply.
Why is it a very bad idea to connect an ammeter directly across a voltage source?
The ammeter is designed, on purpose, so as to have a very low resistance. Doing this will result in an excessive current.
How should a ammeter and voltmeter be connected in series?
no. you want to measure across the desired circuit segment. whether you are measuring voltage drop or current.
How do you calculate the ammeter reading?
The voltage remains the same across the circuit as it is a parallel connection. So, the current across the upper half of the circuit where the ammeter is connected is calculated as I = V/R = 12.04 (total voltage)/12 (Resistance R1) = 1 A. Hence, the ammeter will read 1 A.
Why is voltmeter is connected in parallel and ammeter in series?
Because its function is to measure the current, i.e. the amount of electrical flow in the circuit, and this require that the current flows through the ammeter A good ammeter has very low series resistance, so connecting it in series will not affect your circuit. Be careful when using an ammeter , because of its very low resistance , it can cause a short circuit if you use it by mistake to measure "voltage", so avoid connecting it in Parallel.
How would a voltmeter be wired differently from an ammeter?
An ammeter must be connected in series. The polarity of the meter leads must be correct. meaning you expect positive current then connect the meter accordigly. the meter impedance must be very relativaly low otherwise that will ad a error. An ammeter is not connected in parallel because it is measures the electron flow through a path unlike the voltmeter which measures the difference between two points. Therefore it must be connected in SERIES. If it is connected in parallel it acts like a sorted wire linking the active and neutral conductors and therefore creates what is known as a short circuit.
Why does an ammeter have a low resistance while a voltmeter has high resistance?
I am going to assume that you mean low "resistance" in an open circuit test and are performing this with a multimeter. An ammeter works by place a very small amount of resistance in series with a circuit and then measuring the Voltage drop across the resistance. The Voltage is directly proportional to the current as given in ohms law: E = I x R If you are measuring the resistance through the ammeter it will have a very low resistance and impedance.
What type of meter would be connected on both sides of a resistor in a circuit?
ammeter in series at any side as required since it is bilateral and voltmeter is connected in parallel to measure voltage drop across it
How do you measure the resistance of a motor?
we can measure the resistance of the motor by using voltmeter ammeter method of by directly using a multimeter across the armature terminals of the motor in voltmeter ammeter method we should use a less value of dc voltage to find the resistance
How does an ammeter work?
An ammeter is a low voltage voltmeter in parallel with a small resistance resistor. Current flow through the resistor creates a voltage drop across it which is then measured by the voltmeter.
What would happen if a voltmeter were substituted for an ammeter?
Smoke. Since a voltmeter is in parallel with the load it is right across the source voltage. Putting the amp meter across the line with its low resistance it will act like a fuse, hence the smoke. Newer solid state testers are usually smarter that the operators. They have built in circuitry which sense the wrong settings you are using and shut the tester off with a "beep" to let you know that you are doing something wrong.
If resistor is connected to 6 V battery the ammeter in the circuit reads 2A what is the value of the risistance?
Resistance of the load = voltage across the load/current through the loadWhich means that the resistance would be 3 ohms.(This is only true assuming that the load is purely resistive and the ammeter is ideal.)
