An electrical circuit is one loop of electrical flow. For example your lighting is on one electrical circuit, and you air conditioning is on another. Electricity only powers when it is flowing and requires a completed circuit. When you get an electrical shock, you actually complete the circuit, and this is why those men who work on those high power lines to do not get a shock. Electricity will try and head towards the earth if it has nowhere to go, and that could be you. A short circuit is when electricity is not completing the normal full circuit that was created, say by two bare wires touching together somewhere they are not supposed to be. Water between two wires could cause a circuit to short out.
