# Question: Can A Car Battery Have Voltage But No Amps?

## Can the current be negative?

Consequently, the reference directions of currents are often assigned arbitrarily.

When the circuit is solved, a negative value for the current implies the actual direction of current through that circuit element is opposite that of the chosen reference direction..

## Can a car battery have 12 volts and still be bad?

Cannot reach higher than 10.5 volts when being charged, then the battery has a dead cell. Fully charged (according to the battery charger) but the voltage is 12.4 or less, the battery is sulfated….2) Take a Voltage Reading.State of ChargeVoltage50%12.225%12.0Discharged0 – 11.92 more rows•Jun 5, 2012

## Can you have volts but no amps?

You can get volts with no amps, just means no current flowing. Besides, the volts will be battery volts anyway. Disconnect the solar wiring at the batteries and stick the biggest bulb you have on the wires, if it light up bright you have some current, if not…….

## How many volts and amps does a car battery have?

The standard automotive battery in today’s vehicles is a 12-volt battery. Each battery has six cells, each with 2.1 volts at full charge. A car battery is considered fully charged at 12.6 volts or higher. When the battery’s voltage drops, even a small amount, it makes a big difference in its performance.

## Is 11.9 volts enough to start a car?

However, in practice, the normal voltage for most of the passenger cars can be in the range of 12.2-12.49V, which indicates an incomplete charge. A decrease in performance and the quality of the device begins in the case of reduction to 11.9V or less.

## How many volts does a dead AA battery have?

1.35 voltsAA batteries start off with 1.5 volts of energy, but the voltage goes down as the batteries are used up. Once the batteries dip below 1.35 volts, they appear to be dead, even though they still have a lot of juice left.

## Will current flow if potential difference is zero?

Suppose there is a circuit with the conducting wires having zero resistance. … Since the first branch has no resistance, according to V=IR, the potential difference between the points is zero and hence no charge will flow through the two points and all charges will take the second path.

## Why does a dead battery still have voltage?

In general, the more surface area the chemicals have to deposit charge onto, and take charge away from, the higher the current the battery can produce. … A nearly dead battery still provides 1.5 volts, but has a very high internal resistance so that drawing even a trickle of current zeros out the voltage gain.

## At what voltage should a car battery be replaced?

9.6 VoltsThe battery must maintain a minimum post voltage of 9.6 Volts at 70 degrees F during the test to pass. If the voltage drops below 9.6 volts, the battery is “bad” and needs to be replaced. A faster and easier method to check the condition of a battery is to use an electronic battery conductance tester.

## How many volts should a battery have?

Car Battery Voltage A fully charged battery should read 12.6 volts or above. When the engine is running, that number should be between 13.7 and 14.7 volts. If the battery is reading at 12.4 volts, then it’s 75% charged. At 12 volts, it drops to 25%.

## At what voltage should a 1.5 V battery be replaced?

A reading of 1.3 to 1.5 volts means the battery is good. A brand new battery might show a higher voltage level. Reading at 1.6 or slightly higher is not uncommon, and this is the reason for setting the DCV to a level of 20 volts as the maximum threshold.

## Can current flow without voltage?

Voltage is the Cause, Current is the Effect Voltage attempts to make a current flow, and current will flow if the circuit is complete. … It is possible to have voltage without current, but current cannot flow without voltage.