Milliampere to Ampere: Overview, Questions, Preparation

Electrical Units of Measurement used for expressing standard electrical units. Any scientific measurement or quantity will be measured using SI (International System of Units) units. 

• The ampere(amp) is the base unit of electric current in the SI units. The symbol for ampere is A. 
• Ampere comes from the study of magnetism. The name comes after a French mathematician and physicist, Andre-Marie Ampere.
• Ampere is defined as the current that flows with an electric charge of one coulomb per second.

             1A =1C/s

• The International System of Units defines the ampere in terms of other base units by measuring the electromagnetic force between electrical conductors carrying electric current.
• One ampere is the electric current corresponding to the flow of 1/(1.602 176 634 x 10–19) elementary charges per second.

A milliamp (or milliampere) is a submultiple of the SI base unit of electric current, the ampere. The symbol for milliamp is mA. There are 1,000 milliamps in an amp.

1 milliampere = 10 ⁻³A

1mA = 0.001A

1A =1000mA

In order to convert the milliampere to ampere, use the formula amperes = milliamperes/1000

Milliampere to Ampere for Class 10

Amperes and Milliamperes are the units of the electric current. The common terms you hear with ampere are ampere-hour, milliamp-hour, watts and volts. Mostly the questions from this topic are in the form of numerical problems. The weightage of this topic is less in comparison to the whole chapter.

1. A 350-volt bulb consumes 420 watts of power. How much current is drawn by it?

Answer: Current in amps = watts/volts = 420/350 = 1.2amps

2. If the current consumed by a 70 wattage bulb is 5 amps. What will be the voltage of the bulb?

Answer: volts = 70/5 =14v

3. A 4500-watt dryer runs for 4 hours a day, how many kWh does it consume and if electricity costs 15c per unit, what is the cost of running it?

Answer: kWh = watts/1000* time in hours

4500/1000*4 =18kWh

The cost of running = 15*18 =270c

Q: What is Amp hour and milliAmp hour?

Q: What is the difference between ampere and ampere-hour?

Q: What is the relation between ampere, watts and volts?

Q: What is Ammeter?

Q: What is the difference between amperage and voltage?