Voltage is the unit of current in your battery and is measured in volts. If you're shopping for a new charger and the wattage isn't listed, you can also calculate it with the formula: watts = volts x amps. It's not just cell phones and small devices that rely on chargers – you can also use your knowledge of volts, amps and watts when shopping for car and truck batteries and other common appliances. Amps to Watts Calculator. Amps, volts, and watts are all ways of measuring different aspects of electricity. Copyright ©2020, Batteries Plus LLC. Thinking back to the battery as a water pipe, the current would be the flow rate of the water. One of the most common questions about phone charger wattage is "how many amps does an iPhone need to charge?". I = 100 W/12 V = 8.33 amps. The power drawn by computing equipment is expressed in watts or volt-amps (VA). All rights reserved. Purchasing for a business?Apply for a free business account! If you're shopping for a new charger and the wattage isn't listed, you can also calculate it with the formula: watts = volts x amps. HOWEVER, if you have at least least two of the following three: amps, volts or watts then the missing one can be calculated. Wattage is the total amount of energy being created and is measured in watts or energy per unit of time. In AC circuits, power in watts is equal to the RMS voltage times the current in amps times the power factor. Volt-amps are called the "apparent power" and are the product of the voltage applied to the equipment times the current drawn by the equipment. A lot of times this is also displayed as W = V * A or watts equals volts multiplied by amps. How to convert Watts to Amps or Amps to Watts or Volts to Watts. Wattage is the overall measurement of power that flows through your charger, so a higher cell phone charger wattage means that your device will charge faster. 1 watt is defined as the energy consumption rate of one joule per second. 1-800-677-8278 What would happen if you use a 12-volt battery and a 12-volt light bulb to get 100 watts of power? 1-800-677-8278. Joule is the basic unit for energy. Power (W) = Voltage (V) × Current (A) × PF For example, let’s convert 120 volts to watts, for an AC electrical circuit with 15 amps of current and a power factor of .9. Multiplying amps (water volume) by volts (water pressure) gives you the wattage (the resulting power or energy). How Volts, Amps and Watts Charge Batteries. Amperes (amps) and volts are the basic concepts that one learns when studying electricity in physics. For example, we can calculate the power in watts by referencing the yellow area in the circle. In short, high voltage with a few micro amperes cause nothing to the human body like in high voltage supplying cathode ray tube in traditional TV set or high static voltage in the comb. So, this latter system produces the same power, but with half the current. Both watt and VA ratings have a use and purpose. Amps vs Volts . Ampere (amps or amperage) is an SI unit of electric current and is denoted by 'A'. Duracell is a registered trademark of Duracell U.S. Operations, Inc., used under license. Fees may apply for recycling, environmental disposal, and/or labor/installation. When you buy batteries, you might notice a variety of battery options with different voltages. Sign up to receive info on the latest products, offers & more! The power in watts is the real power drawn by the equipment. If you're not sure whether your device has a limitation on the type of charger that can be used, check with your manufacturer or drop by your local Batteries Plus Bulbs location and one of our experts will be happy to help you find the perfect cell phone charger, car and truck charger and more. In this guide, we'll explore volts, amps and watts, and learn how much power you need for popular devices and chargers. The simple formula for wattage is: If you increase either the voltage or the amps, you'll create more watts and generate more power. So how do all these things work together to power your device? While different batteries and chargers might power the same device, they don't always deliver the same strength. That is if force of one newton pulls something for one meter it is one joule,so if is a weight of about 102 grams (1 N) that is at height of one meter has the energy of one joule. Watts represent the amount of energy produced by the amps and volts working together. If you want to do an electrical calculation involving voltage, current, resistance, or power, reference the formulae circle below. In this formula, P is power, measured in watts, I is the current, measured in amperes, and V is the potential difference (or voltage drop) across the component, measured in volts. But what is battery voltage? Help is just a phone call away! There is an advantage that comes from using less current to make the same amount of power. Basics. I = 100 W/6 V = 16.67 amps. How to Calculate with Watts, Amps, Volts, and Ohms. We strive to provide the best price available on BatteriesPlus.com and in our stores. How does it affect the performance of your battery and your device? Find a Store for Local Pricing and Availability. This pressure makes the current flow through the battery, delivering power to your device. You cannot convert watts to amps, since watts are power and amps are coulombs per second (like converting gallons to miles). The same is true for your battery – higher voltage means higher pressure, so more current flows through the battery. 1 Ampere is defined as the electrical current that flows with electric charge of one Coulomb per second. Some devices, like the iPhone, have a built-in mechanism that only lets them draw one amp of current, even if your charger can offer more. For the quickest charge, pick the device that offers the highest wattage. Have you ever used a new cell phone battery charger and discovered it takes twice as long as usual to charge? If you think of your battery as a water pipe, the voltage would be the water pressure in the pipe. If you were to increase the pressure in your pipe, more water would flow through. All registered trademarks are the property of their respective owners. So how do all these things work together to power your device? Wattage is the overall measurement of power that flows through your charger, so a higher cell phone charger wattage means that your device will charge faster. It is a Newton times a meter. Higher amps mean that electricity is flowing more quickly and delivering more power to your device. Store pricing may vary from the price advertised on BatteriesPlus.com. However, you can still buy a charger with higher amps – it won't hurt your cell phone battery. An ampere, or amp (A or I, for current), is the amount of current in a circuit, while voltage (V) is the strength of the current as it flows through the circuit, and watts (W) are the total electrical power released by circuit per second.