Why does your dishwasher trip the electricity?

Because it's overloading the circuit it's on when it starts up. A dishwasher heats up the water it uses like a mini water heater. It takes a lot of current to do this. Most circuit breakers trip at 20 amps. If you already have 15-18 amps of equipment operating on that circuit, when you turn on the dishwasher, it will trip the breaker. Check to see what circuit your dishwasher's on, then check to see what other big-load equipment you have on that circuit ( e.g. washer, dryer, freezer, water heater, heat pump, etc.). You'll have to turn something off to get the total circuit load down below 20 amps while you're washing dishes. Alternatively, you can have an electrician install a bigger breaker and modify your service to safely carry the load you're asking it to carry.