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28 maj 2015 · $$I_{1/2W} = \sqrt{\frac {1} {2R}}$$ You can also use voltage instead of current: $$P = \frac {V^2} {R}$$ $$V_{1/4W} = \sqrt{\frac R 4}$$ $$V_{1/2W} = \sqrt{\frac R 2}$$ For example, if you have a 100-ohm resistor: $$I_{1/4W} = \sqrt{\frac 1 {4 \cdot 100\ \Omega}} = 50\ \mathrm{mA}$$ $$V_{1/4W} = \sqrt{\frac {100\ \Omega} {4}} = 5\ \mathrm V ...
Om (Ω) – jednostka rezystancji w układzie SI (jednostka pochodna układu SI).
25 paź 2007 · 1/4W and 1/2W ratings indicate the maximum power that the resistor is able to handle for temperatures lower than 70°C. 1/4W resistors are most popular and cheapest. 1/2W is only used in the power circuits.
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Ohm (Ω) Ohm (symbol Ω) jest elektryczną jednostką oporu. Jednostka Ohm została nazwana na cześć George'a Simona Ohma. 1 Ω = 1 V / 1 A = 1 J ⋅ 1 s / 1 C 2. Tabela wartości rezystancji Ohm
20 cze 2016 · Say you only had 220 ohm resistors available, how much current would flow? (Vs - Vf)/resistor = current (5V - 2.2V)/220 = .0127A, 12.7mA And .0127 * .0127 * 220 ohm = 35.4mW. Does that help?
29 paź 2017 · One of the often overlooked qualities of a 1/2 watt resistor over a 1/4 watt resistor is durability. This i think boils down to more strength in the leads for 1/2 watt units. This is the same for using 1/4 watt over 1/8 watt.
