You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
The Feb 2025 Radioddity Giveaway Results are In! Click Here to see who won!

Reply to thread

Message

The energy through the resistor needed to charge the cap does not change with resistance. The energy required to charge the capacitor is a function of its capacitance and voltage, not the resistance the current must pass through to charge it. 0.5CV^2=Watt-seconds. Making the resistor larger only increases the time the resiostor has to dissipate the heat.

You probably do not want to know what that instantaneous power is right at first, its mind boggling. The peak power in a 20Ω resistor charging a .001F cap is 800kW! The good news is that its only that high a tiny fraction of a second.
[ATTACH=full]62696[/ATTACH]

[QUOTE="brandon7861, post: 810959, member: 53724"] The energy through the resistor needed to charge the cap does not change with resistance. The energy required to charge the capacitor is a function of its capacitance and voltage, not the resistance the current must pass through to charge it. 0.5CV^2=Watt-seconds. Making the resistor larger only increases the time the resiostor has to dissipate the heat. You probably do not want to know what that instantaneous power is right at first, its mind boggling. The peak power in a 20Ω resistor charging a .001F cap is 800kW! The good news is that its only that high a tiny fraction of a second. [ATTACH type="full"]62696[/ATTACH] [/QUOTE]

Top Bottom