Milliampere to Ampere: Overview, Questions, Preparation

Updated on Apr 14, 2021 04:38 IST

By Vipra Shrivastava, Senior Manager - Content

Table of content

What is Ampere?
Ampere
Table of Ampere Unit Prefixes
Milliampere
Conversion of Milliampere to Ampere
Conversion Scale
Illustrated Examples
FAQs on Milliampere and Ampere

What is Ampere?

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.

Ampere

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.

Table of Ampere Unit Prefixes

Milliampere

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.

Conversion of Milliampere to Ampere

1 milliampere = 10 ⁻³A

1mA = 0.001A

1A =1000mA

Milliampere (mA)	Ampere (A)
0.01 mA	1.0E-5 A
0.1 mA	0.0001 A
1 mA	0.001 A
2 mA	0.002 A
3 mA	0.003 A
5 mA	0.005 A
10 mA	0.01 A
20 mA	0.02 A
50 mA	0.05 A
100 mA	0.1 A
1000 mA	1 A

Conversion Scale

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.

Illustrated Examples

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

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

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

FAQs on Milliampere and Ampere

Q: What is Amp hour and milliAmp hour?

A: Ampere hour or amp hour is the unit of electric charge. It is a current of one ampere flowing for one hour. A milli ampere-hour is a thousandth of an ampere-hour.

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

A: Amps are a unit of electric current and amp-hours are units of current storage capacity. Amps is an SI base unit whereas Amp-hours is a non-SI metric unit. One ampere-hour is equal to 3600 coulombs.

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

A: Amps = watts/volts

Q: What is Ammeter?

A: An ammeter or ampere meter is a measuring instrument used to measure the current in the circuit.

Q: What is the difference between amperage and voltage?

A: Both voltage, as well as amperage, are the measures of electric current or electrons’ flow. Voltage is a measure of the pressure that allows electrons to flow, while amperage measures the volume of electrons.