Loading converter...
To convert a measurement from Amperes (A) to Milliamperes (mA), you multiply by 1000, as there are 1000 milliamperes in one ampere.
Example:
A small LED uses a current of 0.02 A. Convert this to milliamperes.
0.02 A × 1000 mA/A = 20 mA
Answer: The LED uses 20 mA of current.
Electric current is the rate of flow of electric charge through a conductor. It is the fundamental quantity that powers our world, from lighting our homes to running our computers. Imagine a river: the volume of water flowing past a point each second is analogous to the electric current. Instead of water molecules, the flow consists of charged particles, typically electrons, moving through a wire. For a current to exist, there must be a closed path or circuit for the charges to flow through, and there must be a driving force, known as voltage or potential difference, to push the charges along.
The standard unit of electric current is the Ampere, which is one of the seven base units in the International System of Units (SI). It is a measure of the amount of charge that passes a point in a circuit per unit of time. Understanding current is essential for anyone working with electronics, from electricians and engineers to hobbyists. This converter helps you easily switch between the standard Ampere and its multiples, like milliamperes for small electronic components and kiloamperes for heavy industrial applications, ensuring your calculations are accurate for any scale.
V = IR. It can be rearranged to find current: I = V/R.I = dQ/dt. This means one Ampere is equal to one Coulomb of charge flowing per second.P = VI (Power = Voltage × Current) or P = I²R (Power = Current² × Resistance).Voltage is the potential difference or 'pressure' that causes the charge to flow. Current is the actual rate of flow of the charge. Using a water analogy, voltage is like the water pressure in a hose, while current is like the amount of water flowing out per second.
DC (Direct Current) is the flow of electric charge in one constant direction, such as the current from a battery. AC (Alternating Current) is the flow of charge that periodically reverses direction. The electricity in our homes is AC, as it's more efficient to transmit over long distances.
It depends on many factors, but even small currents can be dangerous. Currents as low as 10-20 milliamperes (0.01-0.02 A) can cause a painful shock and loss of muscle control. Currents over 100 milliamperes (0.1 A) passing through the chest can be lethal by interfering with the heart's rhythm.
He was a French physicist and mathematician in the early 19th century who was one of the founders of the science of classical electromagnetism, which he referred to as 'electrodynamics'. The SI unit of current, the Ampere, is named in his honor.
Current is measured using a device called an ammeter. To measure current, the circuit must be broken and the ammeter inserted in series, so that the current being measured flows through the meter.
Yes, absolutely. A thicker wire has lower resistance and can safely carry more current than a thinner wire. If too much current is passed through a thin wire, it will overheat, potentially melting the insulation and causing a fire. This is why different wire gauges are used for different applications.
By historical convention, current is defined as the direction that positive charge would flow (from the positive terminal to the negative terminal of a battery). However, in most metal conductors, the actual charge carriers are electrons, which are negatively charged and flow in the opposite direction (from negative to positive). For circuit analysis, we almost always use conventional current.
It varies greatly. A small LED light bulb might draw 0.02 Amperes. A laptop charger might draw around 1-2 Amperes. A space heater or a hairdryer can draw up to 12-15 Amperes, which is near the limit for a standard household circuit in the US.