A worker touches a live 120-volt wire. Their skin is perfectly dry and they are wearing standard leather boots, providing a total body resistance ($R$) of 100,000 ohms. Calculate the current ($I$) flowing through their body.

The same worker is now standing in a puddle, sweating profusely, holding a metal pipe, and touches the same 120-volt wire. Their total body resistance drops precipitously to just 1,000 ohms. Calculate the new current flow.

A power tool has a minor short to its metal casing. The grounding prong on the extension cord was broken off. The tool draws 10 Amps to operate normally. The short leaks 0.008 Amps (8 mA) of current directly to the metal casing, which the worker is holding. Will a standard 15-Amp circuit breaker trip? Will a GFCI trip?

An electrician is replacing a motor on a conveyor belt. They turn off the local disconnect switch and place a "Do Not Operate" tag on it, but do not apply a physical padlock. A mechanical crew arrives later, assumes the tag is old, turns the switch on to test the belt, and severely mangles the electrician's hand.

A crane operator is swinging a steel beam into place near overhead 50kV transmission lines. A rigger on the ground is holding a tagline attached to the load. The boom swings within 8 feet of the line. Suddenly, an arc flashes across the air gap to the boom, electrocuting the rigger holding the tagline.