You will need
- - ammeter;
- - ohmmeter;
- - wattmeter;
- - technical documentation.
To convert amps to volts, check the wattage of the appliance or conductor resistance. Power devices can be found in the technical documentation or on the housing. If the documents are not available on the device, check the technical parameters (capacity) on the Internet or measure it with a wattmeter. To determine the resistance of a conductor, use an ohmmeter.
If you know the power of the appliance, in order to convert amperes to volts , use the following formula:U = P/I where:U – voltage in volts,P is power in watts,I is current in amperes.Under "capacity" means the consumption of electrical power.
Example.It is known that the electric motor provides the power 1900 watts. Its efficiency is 50%. Thus, the detected engine fuse for 10 amps.Question.What voltage the motor is designed?Solution.To calculate consumption electrical power divide his effective power efficiency:1900 / 0,5 = 3800 (watts).To calculate the voltage, divide the capacity by current:3800 / 10 = 380 V (volts).Response.For the operation of the motor necessary voltage of 380 volts.
If you know the electrical resistance of a conductor or a simple heating appliance (e.g. iron), then to convert amps to volts , use Ohm's law: U = IR, where R is the conductor resistance, in ohms
Example.The resistance of the spiral electric is 110 ohms. Through the plate passes a current of 2 amperes.Question.What is the voltage of the power supply?Solution.U = 2 * 110 = 220 V (volts).Response.Power supply is 220 volts.
Example.The resistance of the spiral bulbs for flashlight – 90 ohms. In the on state passes through it a current of 0.05 amps.Question.How many standard elements of the power required for operation of the flashlight?Solution.U = is 0.05 * 90 = 4.5 (the volt). The EMF of a single battery is 1.5 volts, therefore, for a lantern you will need 4,5 / 1,5 = 3 such elements.