0
A digital voltmeter is connected to the poles of a 4.5 v-batterywhat will be the display of this voltmeter if the connection was made with a wrong polarity?
Wiki User
∙ 14y ago
It will still be 4.5V except your meter will either indicate "-" for negative or normally no indication at all for positive. If your meter indicates both negative and positive, you will see "+".
Wiki User
∙ 14y ago
Add your answer:
Earn +20 pts
A dc voltmeter may be used directly to measure?
Polarity
Can you reverse the polarity of AC and DC?
We have the capacity to reverse the polarity of a DC voltage, at least as regards what we apply it to. When we consider a DC motor, like, say, the ones in the little "robot wars" we see on TV, the motors can be run in reverse by reversing the polarity of the applied DC voltage. We normally consider AC as already reversing its polarity. It is, after all, AC, which is alternating current. The current alternates because the voltage alternates. We'll avoid any further discussion of the polarity of AC voltages here and leave it at that.AnswerThe problem, here, is that 'polarity' has several different meanings.Polarity, in the sense of 'electric charge' cannot really be applied to a voltage (potential difference) although it can be to a potential (although the polarity is relative; it depends on the point of reference).Polarity, in the sense of 'direction', can be applied to a voltage. For example, is the voltage acting clockwise or counter clockwise around a circuit?Polarity, in the sense of 'connection', can be applied to a voltage. For example, it's important that the line conductor is connected to the centre terminal of an Edison lamp holder or to one or other of the slots in a receptacle (power socket).
What can cause nonstart and all electronics to not function on a 1994 Chevy Suburban?
Bad ground, Bad Battery. Or The battery was connected improperly. I.E Reverse Polarity.
What are the release dates for Polarity - 2012?
Polarity - 2012 was released on: USA: 28 May 2012 (Youtube Your Film Festival)
Is the LM3914 IC protected against reverse polarity?
i would never naturally assume any circuitry to be "reverse polarity" by default even if they are. since this can fry a lot of IC, and micro controllers. there are several options to adding a reverse polarity protection circuit to your project you can find three easy to implement circuits here: http://provideyourown.com/2012/reverse-polarity-protection-circuits/
Is polarity important when testing when testing continuity?
testing polarity of CT by Flick test . A centre zero voltmeter is connected across CT secondary .A 1.5V battery is touched to primary of CT .the deflecting of pointer should be similar in case of each CT to be connected in same protection .
A dc voltmeter may be used directly to measure?
Polarity
How wattmeter is connected in circuit?
A wattmeter has two coils: a current coil and a voltage coil. The current coil is connected in series with the load, while the voltage coil is connected in parallel with the load (just in the same way an ammeter and a voltmeter are connected). The wattmeter's polarity markings must be observed while making these connections -if the wattmeter reads 'downscale' (backwards), then the connection to either one (but not both) of the coils must be reversed.
How do you check the polarity on a car speaker?
With a simple flashlight battery.Connect wires to the speaker then breifly touch the wires to the battery and watch the speaker.If you have positive to positive and negative to negative the speaker will "push outwards" if you have it reversed it will "suck inwards"
Will the voltmeter work when ammeter is connected wrongly in a circuit?
The volt meter should work. The meter is connected across the supply where as the amp meter is connected in series with any load that it is metering. On larger installations to measure the amperage, a current transformer is connected around the conductor to be monitored. If a CT is used then the polarity has to be observed when connecting to an amp meter.
What type of electrolytic capacitor will be permanently damaged if connected to the incorrect polarity?
A polarized capacitor will be permanently damaged if connected to the incorrect polarity.
What is the aim of doing polarity test on the transformer?
Knowing the polarity of transformers is important if they are to be connected in parallel.
Why is polarity test done?
On the CT there will be a white dot that represents a polarity mark. This is used to connect to the correct polarity terminal on the device that the CT is connected to. Additional CT transformers must be connected to the recording or monitoring device using the same polarity as the first CT.
Which supply has polarity AC or DC?
DC has polarity, while AC is constantly reversing in polarity.AnswerWhile the previous answer is quite correct in the sense of 'positive' and 'negative' charges, it's worth pointing out that 'polarity' has a second meaning in a.c. systems. In a.c., the term 'polarity' is used to describe the correct connection of the supply's line and neutral terminals. For example, with an Edison screw lamp holder, to remove the risk of shock, it's important that the line conductor is connected to the centre terminal, and the neutral conductor is connected to the outer terminal. If this has been done correctly, then we say that its 'polarity' is correct. Similarly, if the terminals of a socket outlet (receptacle) are connected the correct way around, then their 'polarity' is correct. Testing for the correct connections in an a.c. electrical system is called a 'polarity test'.
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 capacitor burst?
Electrolytic capacitors tend to explode when connected to AC or to DC currents of the wrong polarity. The plates short out because the dielectric is maintained by a polarized field, and is then destroyed by the wrong polarity.
What would cause a battery on a forklift to explode?
Overcharging by the alternator or if it is connected in reverse polarity.
