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Why cant you use voltmeter 2 calculate emf of a cell?
because voltmeter is used to measure the voltage
To measure EMF you would use a(n)?
"voltmeter"
What provides a voltage difference in a cell?
Voltage is the colloquial term. Actually the word potential difference is to be used. More over emf is another term to be used. Emf is the pd of a cell when it is not placed in a closed circuit or the cell does not deliver any current. As the cell delivers the current then emf will be reduced by an amount of pd across the internal resistance of the cell.Here emf is by chemical energy converted into electrical formSame emf can also be produced by using magnetic flux or heat energy and even mechanical energy.If we use magnetic flux then it is known as electromagnetic inductionAs we use heat, then it is termed as thermo emfEven mechanical energy gives out emf in case of crystals. This is known as piezo electricityAlso as we make a circuit with a cell, resistance and a switch and as we switch on then current flows through resistance and a potential drop is produced across the resistance given by the expression V = i RThis is also known as the voltage drop across the resistor.AnswerVoltage, or potential difference, is created by charge separation which, as the previous answer indicates, can be achieved in numerous ways. A simple chemical cell or battery, for example, separates charge chemically, causing an imbalance in the quantity of electrons in and, therefore, the charges on, its two electrodes. As a result, one electrode has a higher potential than the other, so there is a potential difference between the two.
Is lenz law used to find induced EMF's?
It's primary usage is to determine the nature of an induced EMF from changes in the magnetic flux through a circuit. However, you must use Faraday's Law (and a unit conversion factor) to determine the SIZE of such an EMF.
What does the cell membrane use for energy?
The cell membrane does not use energy.
How do you determine the emf and internal resistance of a cell?
You can measure the emf of a cell by using a voltmeter, as this draws current from a cell. You can use the voltage, the emf, and the load resistance to determine the internal resistance of the cell.
Can the potential difference across a battery be greater than its EMF?
If the emf of a battery is E Volt, the potential difference across a battery is given byV = E -I r where I is the current in the circuit and r is the inetrnal resistance.Hence E and V will be equal only when I = 0.The maximum potential difference across the battery will be equal to E only if I = 0.In gnereral potential difference can be equal or less than the emf.E.m.f can never exceed the potential difference.=====================================A battery charger is a device used to put energy into a secondary cell or (rechargeable) batteryby forcing an electric current through it.Hence to charge a battery another source of emf is needed.The combined emf is now will be (E - E1) where E is the emf of the battey in quesiton and E 1 is the emf of the external source used to charge the battery.Note that E-E1 will be negative in sign.======================================...A battery is charged only when its emf is less than its maximum emf.Suppose that the maximum emf of a cell is 1.5V. The battery should be charged only when its emf is less than 1.5 V say 0.5 V.To charge the cell we use a different source of emf E1 say 3V.The positive of the second source is connected to the negative of the cell so that theCombined emf is now 0.5 - 3 = -2.5V.The negative sign indicates that the emf is opposite to the emf of the cell which is 0.5V.Since the cell is getting charged, the difference in emf is gradually reduced to zero when the cell is fully charged.In modern charging units there are provisions so that the cell is never allowed to be over charged, even if the charging unit is in on for about 12 hours.When the cell is fully charged, (that is when the emf of the cell is now 1.5V), the potential difference between either the second source or cell will be zero.Taking into consideration the sign of the emf and the direction of current through the cell and the sign of the potential difference, the potential difference will be always less than the emf of the cell (which gradually increases while charging).Note that the potential difference is negative if the emf of the cell is taken as positive.Also note that the cell is charged only when its emf is less than its maximum e.m.f
Why cant you use voltmeter 2 calculate emf of a cell?
because voltmeter is used to measure the voltage
How do you measure EMF?
Use a voltmeter.
To measure EMF you would use a(n)?
"voltmeter"
What provides a voltage difference in a cell?
Voltage is the colloquial term. Actually the word potential difference is to be used. More over emf is another term to be used. Emf is the pd of a cell when it is not placed in a closed circuit or the cell does not deliver any current. As the cell delivers the current then emf will be reduced by an amount of pd across the internal resistance of the cell.Here emf is by chemical energy converted into electrical formSame emf can also be produced by using magnetic flux or heat energy and even mechanical energy.If we use magnetic flux then it is known as electromagnetic inductionAs we use heat, then it is termed as thermo emfEven mechanical energy gives out emf in case of crystals. This is known as piezo electricityAlso as we make a circuit with a cell, resistance and a switch and as we switch on then current flows through resistance and a potential drop is produced across the resistance given by the expression V = i RThis is also known as the voltage drop across the resistor.AnswerVoltage, or potential difference, is created by charge separation which, as the previous answer indicates, can be achieved in numerous ways. A simple chemical cell or battery, for example, separates charge chemically, causing an imbalance in the quantity of electrons in and, therefore, the charges on, its two electrodes. As a result, one electrode has a higher potential than the other, so there is a potential difference between the two.
How do EMs work?
The EMF works by detecting electromagnetic fields that are present. You use an EMF detector, like a K-II meter to detect these fields. EMF fields that are too high can be dangerous, and can cause nausea, dizziness, paranoia, and other things.
Is lenz law used to find induced EMF's?
It's primary usage is to determine the nature of an induced EMF from changes in the magnetic flux through a circuit. However, you must use Faraday's Law (and a unit conversion factor) to determine the SIZE of such an EMF.
How can you make one cell always equal another cell even if you insert a line above it in Excel?
In Excel, if you want a cell to always equal a specifc cell, use "$" -- for example, if you want the current cell to always equal A2, even when inserting rows or columns, use the formula: =A$2$
What type of clothing is not authorized for use during air force operations?
EMF shielded
Can wire in teeth work attract EMF toward the mouth or ears?
If I had a medical test done in my early 30's and they used a contrastmedia xray diedand then later afte tht I tried to use cell phone and I have a terrible sensitivity to cell phones where I can't even use them or be around someone who does..... Because of that medcal test where they shot the contract dye up theough my femural artery and I had an allergic burning sensation in my head to the dye whicle theyse x-rays were being given....I am thinking that is why I have trouble around cell phone as well as cordless. I slso have a piece of wire in my mouth as a full time permanent retainer to help keep some teeth straight. I am about to have that removed and see if I will still feel the EMF off of the cell phone. Can you give me any help or suggestions?? Thank you.....Lois.
Would a phone with audio and video be a good ghost hunting tool and or gear?
It depends.... I always advise people to take a cell phone with you for emergency and safety reasons. If you mean to use as a tool in a paranormal investigation, you're better off with a voice recorder, and still/video cameras. This is because the spectrum of a quality camera and voice recorder is much better. Plus you can get IR, and infrared cameras, as well as extended frequency voice recorders. But if you don't have any of that stuff, its better than nothing I suppose. If you do take a cell phone with you, remember it can produce false readings on EMF recorders. The KII meter can also pick up the "ping" a cell phone sends to the tower on a regular basis even if the phone is not being used. If you use EMF/ELF meters in your hunt remove all cell phone batteries from the phone when doing your readings.
