How Do You Calculate The Peak Voltage Across A Resistor?
When speaking of high frequencies across the resistor, where the thermal timescale is much longer than the period of the signal, we can work with the RMS: root mean squared voltage, just as if it were a DC voltage, to ensure that the resistor isn’t overloaded. Hint: thermal timescales are slow, such as several seconds. Unless your frequency is less than 1 Hz, you can use this trick. Allowable power in the resistor, in terms of applied RMS voltage and resistance P_allow = V_rms^2/R This can be derived from P=I*V and V=I*R, but this is a result worth memorizing.
