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## How much power is used by a 12 V car battery that draws 0.5 a of current?

Physics 4-26

Question | Answer |
---|---|

How much power is used by a 12.0V car battery that draws 0.5 A of current? | 6W |

When plugged into a 120 V wall outlet, how much current is used by an electric blanket rated at 140W? | 1.2 A |

A 120 Watt light bulb is connected to a 120 V outlet. how much current is in the light bulb? | 1 A |

## What is 50% of a 12-volt battery?

**12.2 volts** is a 50% discharge on a standard 12 volt battery. Gel batteries are a little different and have a voltage of around 12.85 when fully charged.

## How many watts does a 12v battery use?

How many Watt-Hours in a battery?: Watts are pretty simple – it is just battery voltage times amp-hours. A 12 volt 105 AH battery can supply (under perfect conditions and to 100% discharge) 12 x 105, or **1260 Watt-hours** (1.26 kWh).

## How many amps are in a 12 volt car battery?

Car batteries will typically have a capacity of **48 amp hours**. What this means is a fully-charged 12-volt car battery rated at 48 amp hours can deliver 1 amp for 48 hours or 2 amps for 24 hours. This also means the battery can supply 8 amps for 6 hours under ideal operating conditions.

## How do I calculate current?

The current is the ratio of the potential difference and the resistance. It is represented as (I). The current formula is given as **I = V/R**. The SI unit of current is Ampere (Amp).

## What is the resistance of a curling iron that draws 12 A of current on a 120 V circuit?

What is the resistance of a curling iron that draws 12 A of current on a 120 V circuit? **R = v= 120v = 100 Gu .** 1.1.

## How low can you drain a 12v battery?

No 12-volt battery will remain at over 14 volts for more than seconds unless it’s being charged. The lowest limit is **10.5 volts** (used in testing) and obviously unsatisfactory in practical use. Experienced RVers try to use no more than 20% to 50% of the energy available in a battery before recharging.

## How low can a car battery voltage go?

This voltage range means the battery is in good condition for starting the vehicle. If the measured reading is less than **12.2 volts**, the battery’s resting voltage is weak, which means it most likely needs to be charged or replaced.

## How many watts can a 12V car outlet handle?

If you divide 15 by 12 you get **180 Watts**, which is your safety zone, because most cars use a 12V system and have a cigarette lighter that has 15 Amps. If you surpass the ceiling of 180 Watt, you will have a blow up.

## How do I calculate 12V power consumption?

Determine the Average Daily Load

The 12 volt system you have is rated at 0.2 amps at 12 volts. Multiply the amps by the hours and you get the result of **1.2 amp-hours per day**. You use three 20 watt 12 volt lights for about four hours each night. The power consumption for each light we worked out earlier to be 1.67 amps.

## How many watts is 12vdc?

Equivalent Volts and Watts Measurements

Voltage | Power | Current |
---|---|---|

12 Volts | 12 Watts |
1 Amps |

12 Volts | 24 Watts | 2 Amps |

12 Volts | 36 Watts | 3 Amps |

12 Volts | 48 Watts | 4 Amps |