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With a useful selection of tools, typical materials and supplies on hand, and some home repair information or experience, a home-owner or handyman should be able to carry out a large number of DIY home repairs and identify those that will need the specialized attention of others.
The positive and negative wires spark when touched because they form a short circuit, which means that the current flows through the wires without any resistance or load.
This causes a lot of heat and energy to be released, which can create sparks and even fire.
When a DC voltage is applied to the primary winding of a transformer, due to low resistance, the winding acts as a short circuit across the terminals of the DC source that leads to the flow of heavy current through the winding resulting in overheating of the winding.
If a person hangs onto a live wire with both hands, completing a circuit by providing a path to the ground, they are likely to get shocked.
The fuse in an electrical plug serves as a safety device.
