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Why does the total emf of dry cell in series not equal in the reading of voltmeter?
Wiki User
∙ 11y ago
because in ckt connection there r done some ohmic loss due to the connecting wires and other factor , so voltmeter reading is not equal to its rated reading.
and this also done due to different error like instrument error , measurement error etc...
Wiki User
∙ 11y ago
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Equation for voltage in a parallel circuit?
You can measure across *any* component - see the answer on measuring voltage.For any resistance measurement, be SURE that:1. The circuit is disconnected from the power supply, and2. "Energy storage" components such as capacitors are discharged.If the circuit does contain capacitors of reasonable size (microfarads or more) these may demand some power from the meter to charge them, so you can get an artificially low reading at first, but it will rise to the correct value as the capacitors charge.
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What is the scientific calculation of the radiation emitted from various radioactive sources?
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What are the laws of series and parallel connection?
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How do you connect a voltmeter in parallel circuit?
A voltmeter is used to measure potential difference across two points in an electrical circuit . The voltmeter is connected in parallel across the circuit element (resistance ) so that its inclusion in the circuit has negligible effect on total resistance and current flowing in yhe circuit A voltmeter has high resistance,if connected in series it will increase of circuit and reduce the current in the circuit
What path will the current takes in a series circuit with a voltmeter pause does the current goes through voltmeter pause because if it does pause isn't current suppose to be taking the shortest path?
A voltmeter is designed to operate like a very large resistor (order of megaOhms), in parallel to the circuit that it is measuring. As long as the voltmeter resistance is much larger than the circuit that it is measuring, it will draw very little current away from the circuit and will only minimally disturb the operating circuit. See related link. If the voltmeter is connected in series with the rest of the circuit, then that is the same as connecting a very large resistor in series.So for example if you have 10 volt battery and a 10 ohm resistor, that would be 1 amp (without the voltmeter). Now if the voltmeter is 10 megaohm, the total resistance is 10000010 ohms, so the current is 0.999999 microamperes, and the voltage across the 10 ohm resistor is 9.99999 microvolts, while the voltage across the voltmeter is 9.999990 Volts (these numbers are rounded, but you get the idea).Suppose you put in series with a 1 kiloOhm (not sure about that spelling) resistor. The total resistance is 10001000 ohms, and current is 0.99990 microamperes, the voltage across resistor is now 0.9999 millivolts (it was microvolts) and the voltage across the voltmeter is 9.9990001 volts
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To measure the total emf simply connect the battery and voltmeter with the right terminals , but to measure the terminal potential difference which is less than the emf the voltmeter is connected in parallel with the battery
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What is total voltage in a series circuits?
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Assuming the new lamp is in series, the ammeter reading falls because the total resistance has increased. By how much depends on how the lamp resistance depends on voltage. If the lamp is added in parallel to the first, then the ammeter reading doubles.
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The batteries can be connected in parallel or in series. In parallel, good batteries of the same voltage will have a total voltage across them equal to the voltage across one of them. Those batteries in series will have a total voltage equal to the sum of the voltage of each of the batteries.
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Equation for voltage in a parallel circuit?
You can measure across *any* component - see the answer on measuring voltage.For any resistance measurement, be SURE that:1. The circuit is disconnected from the power supply, and2. "Energy storage" components such as capacitors are discharged.If the circuit does contain capacitors of reasonable size (microfarads or more) these may demand some power from the meter to charge them, so you can get an artificially low reading at first, but it will rise to the correct value as the capacitors charge.
How do you find least count of voltmeter and ammeter?
Least count of voltmeter is the value of one division on the scale. Formula is: Least count = Range/No. of divisions For example, if a voltmeter can measure from 0 to 40 V, and it has 100 divisions in total on the scale, then its least count is 40/100 = 0.4V
