why using capacitor to reduce electricity bill not good enough?
Using capacitors to reduce electricity bills isn't a good enough solution for most households because it only addresses a specific type of electrical load, known as reactive power. Here's why:
Only Reduces Reactive Power: Capacitors are effective in reducing the reactive power component in an electrical system, which occurs when inductive loads (like motors and transformers) create a phase difference between voltage and current. In most households, the majority of the load is resistive (such as lights, heaters, and electronics), which does not produce reactive power. Therefore, capacitors won't significantly reduce the electricity bill in these cases.
Doesn't Affect Active Power: Electricity bills are primarily based on active power (the power that actually does useful work, like running appliances). Capacitors correct the power factor (i.e., improve the efficiency of the electrical system) but don't reduce the actual energy consumed by resistive loads.
Applies More to Industrial Settings: Power factor correction using capacitors is more beneficial in industrial environments with heavy inductive loads, where reactive power is more significant. In these cases, utilities often charge for poor power factor. However, residential consumers typically aren't billed separately for reactive power.
Limited Impact in Residential Use: Since most residential appliances (aside from large HVAC systems or machinery) don't generate significant reactive power, the benefit of installing capacitors at home is minimal, and you won't see a noticeable reduction in the electricity bill.
To achieve better savings at home, focusing on energy-efficient appliances, turning off unused devices, and using proper insulation are more effective methods.