Battery Power Vs Voltage: Comparative Analysis And Detailed Facts

In this article, we shall discuss Battery Power Vs Voltage. Battery voltage is the measure of electric potential a battery holds, and battery power is the measure of the electric energy stored in the battery.

Here is a comparison table of Battery Power Vs Voltage:

Parameter Battery Power Battery Voltage
Definition Battery Power is the amount of electrical energy stored inside a battery. It is sometimes called “power capacity” also. Battery voltage is the electric potential difference between the positive and the negative terminals of the battery. 
Formula Power is generally voltage multiplied by the current. ( P = VI ) In a circuit, battery voltage V= the current in the circuit (I ) × Equivalent resistance of the circuit (R)
Unit The unit of power is Watt. But the rating we see written on a battery is actually the battery capacity. Its unit can be watt hour and ampere hour.  The SI Unit of battery voltage is Volts ( kg⋅m2⋅s−3⋅A−1 ). 
Effect  Power provides the battery with the ability to make a device usable. Voltage is the pushing force for electrons, and it controls the current flow when a battery is used. 
Relation with current Battery capacity measured in ampere hour takes current into account. The more the current, the more the battery capacity. The current in a circuit depends upon the voltage. Greater battery voltage means more electron flow and higher current generation.
Inter-relation Battery power can be written as a function of battery voltage and current. Battery voltage is independent of the battery power. Rather the battery power is derived from the battery voltage.
Example A 10 Watt hour battery suggests that it can deliver 10 Watts of power in an hour or 5 watts of power in two hours or 2 watts of power in 5 hours. It is basically the average power over a certain time. A 3000 maH battery means it can provide power to a device that draws 3000 mA current in an hour or 300 mA current in 10 hours.   A 10 Volt battery means that the potential difference between its two terminals is 10 Volt. If we keep lower potential at V volts, the higher potential will be at (V+10) volts.

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Battery Power Vs Voltage- FAQs

Does a higher voltage battery mean more power?

Voltage provides information about potential. We can receive the same power from different voltage sources if we adjust the current values. For two circuits with equal current, higher voltage yields more power.

From ohm’s law, we know voltage V = i (current) × R (resistance) and power = voltage × current. So, for a significant amount of power, both the current and the voltage must be high. For example- A 10 V source and 2 Amp current give 20 watt power. Also, a 5 V source and 4 amp current give the same 20 watt power.

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Does battery voltage affect power?

Chemical reactions inside a battery induce voltage. It is called battery voltage. Voltage is the rate of flow of electrons or current flow. Power is a combined function of current flow and voltage.

Voltage is one of the two factors that generate power. For the generation of a certain amount of power, there can be any combination of current and voltage. For example, a 20 mA and 200 V battery produce 20 × 200= 4 watts of power. Similarly, a 400 mA and 10 V battery also produces 400 × 10 = 4 watts of power.

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Do batteries supply current or voltage?

Batteries are primarily considered as a voltage source in a circuit. A battery maintains constant voltage for some time, and gradually voltage decreases. Free electron flow in the circuit generates a current.

Voltage sources draw constant current irrespective of the voltage. Current sources draw constant current irrespective of the load. So, a battery can be said to be a constant voltage source. But it is not a current source since it can not draw an equal amount of current for different load resistances.

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