electrical engineering calculator online

#Electrical engineering calculator online series

The calculator advises that the user choose a resistor having a power rating about two to ten times the calculated value to avoid excessive temperature rise.

#Electrical engineering calculator online series

LED series resistor calculator: This tool is used to calculate the resistance needed to drive one or more series-connected LEDs from a voltage source at a specified current level. A chart is provided showing the inductances. Inductance conversion has these fields, which can be populated, any one of which translates into the other fields: Picohenry, nanohenry, microhenry, millihenry, henry and kilohenry. A newton, accordingly, is a function of space, time and mass. One newton = one kilogram meter/second squared. Relevant formulas are: 0ne newton = one Joule/meter.

A Joule, for example, is equal to 0.2390057361 thermochemical calories, each of which is about a thousand times larger than a nutritional calorie.įorce conversion: Fields are newtons, gram-force, metric ton-force, short ton-force, sthene (if you’re wondering, this is an obsolete unit of force or thrust in the meter–ton–second system of units introduced in France in 1919), pound-force, dyne, poundal and long ton-force (UK). For example, enter one Joule and you are instantly informed about the amount of energy in each of the above measurements. A related graphic with a slider locates the fractional result when a decimal is entered.Įnergy conversion: The fields that can be populated are British thermal units, Joules, kilowatt hours, therms, calories (nutritional) and calories (thermochemical). The resulting fractions use the closest value based on the denominator selected. ĭecimal fraction conversion: This tool converts decimal values to their equivalent fractional values. The formula is I n (the current through resistor R n) = I s (R total /R n) where R total = The total equivalent parallel resistance of the resistor array across the current source and I s is the current from the source.ĭBm to watts conversion: To operate this converter, the user fills in either the decibel-milliwatt field or the watt field. Given a capacitance value as well as beginning and end voltages, this calculator solves for either time or resistance, calculating the resulting initial power dissipation in the resistance and the total energy to zero volts.Ĭurrent-divider calculator: This tool calculates the current flow through each of up to ten parallel resistances connected to a power source. If no multiplier is given, the result is capacitance in pF.Ĭapacitor safety discharge calculator: The tool is used for calculations involving the discharge of a capacitor through a fixed resistance. An accompanying chart lets you find the capacitance by looking up the capacitor code: The first two digits are the value in picofarads, while the third is the multiplier. This calculator is handy if, in the first stage of designing a mobile device, you must choose a battery and allocate space for it.Ĭapacitance conversion: This tool converts capacitance values into units of picofarad, nanofarad, microfarad and Farad. Here are few highlights:īattery-life calculator: The battery-life calculator depends upon one simple algebraic formula: Battery life = (battery capacity in mAh/load current in mAh). Some are simple, one-step operations, while others are more complex. Hosted on the Digi-Key site are highly instructive conversion and calculation tools, each with a quick tutorial. That brings us to Digi-Key which has assembled a set of electronics converters and calculators that aim to accelerate workflow in the lab or shop. provides numerous online calculators for engineers of which a little over 100 are in electronics and electrical engineering. But when it comes to electronics and engineering, the pickings are slimmer. Consider that one site dubbed now hosts over 1,800 online calculators in various disciplines.