-- The resistance of the wire is proportional to its length.
-- When the length is reduced by 1/2 , the resistance is also reduced by 1/2 .
-- Reducing the resistance across the battery by 1/2 causes the current to double.
-- The new current is 100 mA.
(Assumes zero internal resistance in the battery, and that the 4.5 volts doesn't 'sag'.)
The voltage (V) between its terminals. ~Gabby
When batteries are connected in parallel, the voltage remains the same as the voltage of a single battery. This is because the positive terminals are connected together and the negative terminals are connected together, so the voltage across each battery remains constant.
Real-world batteries do not have zero internal resistance. When one connects a load (resistance) to a battery, current begins to flow and the open-circuit potential is divided between the battery's internal resistance and the resistance of the load. Thus, one will measure a lower voltage at the battery terminals when a load is connected, compared to no-load conditions.
The energy delivered by a battery would depend on-- the battery's voltage-- the resistance of the load connected across its output terminals-- the length of the time the load is connectedThe power delivered by the battery is [ (voltage)2 divided by (load resistance) ].The total energy delivered by the battery is [ (power) multiplied by (time the load is connected) ].
The current depends on what is connected to the battery's terminals. If nothing is connected to it, then there is no current, and the battery lasts quite a while. In general, the current is 1.5/resistance of the external circuit connected to the battery until that number gets too big, and then the voltage of the battery sags, because it can't deliver that much current.
Potential difference (voltage)
A direct current is obtained from a connection to a battery.
disconnect both terminals from the battery, then touch the terminals together, not connected to the battery, voila! you're done.
Yes. For example, a car battery always has a voltage of 12V (unless it gets completely unloaded, of course), between its terminals. But a current will only flow if cables are connected.
The energy stored in the chemicals of the battery
Related to a battery and open load is the battery just sitting there without anything connected. A short is a very low resistance attached to the tow terminals of the battery. For example, a wire connected across the battery terminals would constitute a short.
The current in a circuit, expressed in milliamperes, is1,000 x (battery or power supply voltage)/(resistance connected between the power supply terminals)If you increase the voltage of the battery or power supply, the current in the circuitincreases proportionally, at least until something in the circuit gets hot, melts, fuses,and opens the circuit.