small current flows through the bleeder resistor, wasting a small amount of power. The value of the resistor is chosen to be low enough that the charge on the capacitor bleeds off quickly, but high enough that the resistor will not consume too much power while the supply is on. High voltage supply in television sets The high voltage power supplies of CRT type television sets and computer monitors generate voltages of 30–40 kV, which are a much greater electrocution hazard. This higher voltage requires higher value bleeder resistors to avoid unnecessarily loading the supply circuits. The bleeder resistor commonly found inside a flyback transformer is valued in the hundreds of megaohms range, and can therefore not be measured with the common technician's multimeter. Instead of a resistor inside the transformer, the focus and screen control array may be used for the same purpose, depending on the application and tolerances of the type of tube it is producing output for. These bleeders discharge the focus supply, but not the high voltage final anode feed. The CRT itself forms a capacitor that can hold a sizable (and very dangerous) high voltage charge, so it is always advisable to momentarily ground a CRT's high voltage terminal before working on the unit. Design considerations There is always a trade-off between the speed with which the bleeder operates and the amount of power wasted in the bleeder; a lower resistance value results in a faster bleed-down rate but wastes more power during normal, power-on operation. The presence of a bleeder also guarantees a minimum load on the power source, which can help reduce the range of voltage change (regulation) when the normal load is changing and there is no active regulator. Use of a bleeder this way is a common design strategy for power supplies of vacuum tube power amplifiers, for instance. Large capacitors can actually recover a substantial part of their charge after being discharged by the bleeder resistor, if the resistor is not left in place. This is due to a property called dielectric absorption, in which energy stored in the dielectric during use is released gradually over time through dielectric relaxation. Therefore the bleeder should ideally be connected permanently. Failure The failure of a bleeder resistor prevents the discharge of the capacitors, resulting in dangerous voltages being retained for many days. This is one of several reasons for the typical warning