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That depends on the chemistry:
- carbon-zinc or alkaline: 1.5V
- nickel-cadmium or nickel-metal hydride: 1.2V
- zinc-nickel: 1.6V
- lead acid gell: 2V
- lithium ion: 3V
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Is a fresh dry cell kinetic or potential energy?
it has kinetic energy..the!!
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
What 2 things do you need for a current to flow?
Potential difference and the conductor. A cell and a bulb. Some connecting wires. The bulb can be made glow by connecting the wires with the cell.
What variable represents potential difference?
The variable that represents potential difference is V, which stands for voltage.
What is the electrical unit of potential difference?
Potential Difference is measured in Volts
Because it has a potential difference between the positive and negative terminals what can act as an electron pump?
dry cell
What is meant by a cell has a voltage of 1.5volt?
No. The potential DIFFERENCE of a battery (or, more accurately, a dry cell) is 1.5 V.
What is the difference between cell potential and standard cell potential?
the standard cell potential is the cell potential at standard conditions (25C , 1 atm , and 1M ) but the cell potential is the cell potential of the cell under a real condition and we use nernst equation . i hope this is useful
What is the role of a dry cell in a torch?
To provide the electric potential difference required to get a current flowing through the bulb and the torch to produce light.
Is a fresh dry cell kinetic or potential energy?
it has kinetic energy..the!!
What is the potential difference of daniell cell?
1.10 V
What are other terms for cell voltage?
Potential Difference.
What is the difference between a dry cell and a voltaic cell?
Electrolyte. sulphuric acid
What is the cell potential?
the difference in reduction potentials of the half-cells
Difference in a charge between two electrodes in a cell causes a ----between electrodes?
Potential difference.
Describes the difference in the concentrations of a substance across a cell membrane?
action potential
Difference between dry cell and wet cell?
a dry cell is a cell that has electrolyte that is a paste a wet cell is a cell that has a liquid electrolyte -sads
