- to compute the resistance of the wire (R) when you know the material the wire is made of, either the diameter of the wire (d) or the cross-sectional area of the wire (S) and the length of the wire (L)
- to find the length of the wire (L) when you know the material, either the diameter (d) or cross-sectional area (S) and the desired resistance of the wire (R)

resistors in parallel

capacitors in series

inductances in parallel

LC resonance circuit

bandspread capacitors circuit

single-layer air-cored coil

circular loop coil

square loop coil

frequency,wavelength,period

three-digit capacitor markings

resistor codes (4 bands)

resistor codes (5 bands)

choke/inductor color codes

555 astable

555 monostable

match standard Ex value

combine standard E6, E12 & E24 values

LM317 voltage regulator

dBm ⇆ mW converter

mm ⇆ in converter

resistance of a wire

Ohm's law

dropping resistor for 'P' tubes

dropping capacitor for 'P' tubes

dropping resistor for 'U' tubes

dropping capacitor for 'U' tubes

line-of-sight

dropping resistor for LEDs

Y-Δ transform

Y-Δ transform (capacitances)

parabolic antenna gain

AWG converter

[ekalk]© Sławek Wernikowski, 2012-2022. Set of useful interactive calculators for electronics constructors and hams.

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