i have a problem in electrics in physics:?

Question

i have a problem in electrics in physics:

a dry battery of emf=3.0 volts supplies current thru a circuit in which the resistance can be changed. a high resistance voltmeter is connected across the bettery. as the current in the circuit is increased,the voltmeter reading decreases.explain this....


i cannot get that if the current increases(meaning the resistance must have been decreased), then why does the voltage increase?...i mean voltage is fixed,isnt it?

what exactly is the voltage measuring here...the terminal voltage--- isnt it?

BHAVYA: look, as the value of I increases,the VALUE OF R IS DECREASING.....
THE QUESTION SAYS THAT RESISTANCE IS VARIABLE.....BUT VOLTAGE WILL OBVIOUSLY BE CONSTANT

look here, miss vandana j : i HAVE READ MY TEXT...if u do not have any answer to offer,then its better not to comment at all....i need a theorotical answer

i am not a fool here, asking ur help if i cud have done it without that......so plz behave

thank you,wavy

george p: just writing this for those who see ur answer after me n will tend to get confused perhaps.....

the current is being increased.....so the answer shud be more or less compatible to that....u may be correct,but the answer wont be right...they have given u a condition....

wavy's answer is right

Answer 1

now as the battery is discharging by supplying current
the formula used will be
v=e-ir

now u can c that as the value of i increases the corresponding value of e will decrease and hence the voltmeter reading vil decrease

Answer 2

A real battery has its own internal resistance. A correct circuit diagram would show the battery as an ideal battery (perfect voltage source) with a series resistor. You see the terminals, after the resistor. As you draw more current from the battery, its actual voltage, as viewed on its real terminals, decreases due to the drop of the internal resistance. Try it for awhile and feel the battery. Warm, huh? Yup, its the internal resistance. BTW, it is not a resistor, just the resistance inherent in the chemical stuff.

Answer 3

In any circuit overallpower should remain constant, i.e. energy supplied=energy consumed. power =Voltage x current. so, if you are increasing current, Voltage should decrease, In order to hold the equillibrium condition. you know voltage between ends of same conductor is zero. there you get maximum current & when there is no current you get maximum voltage (i.e. terminal voltage).

Answer 4

I even have been a grasp Electrician for 40 two years and a electric Contractor for twenty-four of those years. I had to snort at a number of the solutions above. We left the 50-cycle grant back in the early 60's. Now almost each and every little thing is 60 cycle. You often have a 240-volt grant in residential and despite if in some purposes you will have 3-section grant in homestead. That relies upon on your electric enterprise and their policies. to respond to your question on the subject of the version in 3 section and unmarried section, 3 section is in simple terms that with each and every section being one hundred eighty levels out of section with one yet another. it is an application for the two marketplace and commercial bills and it quite is used for heavy machines or kit. right here in this us of a, you are able to hardly locate enjoyed ones home equipment in 3 section. maximum is the two one hundred twenty volt or 240 volt. the better the voltage, the fewer amperage you will use. this suggests a decrease electric bill. Your electric meter is measured in watt hours and the fewer amperage you employ, the fewer in watt-hours you consume. despite if it quite is not commonplace, you ought to purchase fridges and somewhat some different home equipment in 240 volt. needless to say your kitchen will could be under pressure for this, regardless of the undeniable fact that it's not unprecedented. commonplace is one hundred twenty volt in the kitchen and frequently the only 240-volt grant stands out as the clothing dryer. nevertheless, in the journey that your attempting to maintain on your electric bill, 240 volt unmarried section or perhaps 230 volt 3 section is the thank you to pass. usa is in the back of the instances with the universal public of home equipment being purely one hundred twenty volt while the huge majority of Europe is 240 volt.

Answer 5

Check The resistance capacity. Current always varies with the voltage. it is not constant. becaue if resistance is kept constant they have to varry i.e current or voltage

best of luck if u have exams or ask ur teacher

Answer 6

go and read the chapter in the book.ask any electric enjeneer if you know or ur teacher because i think u will understand this if u r taught pratically