Which of the following would act as the best insulator of electric current?

1- water.
2- a tree.
3- a copper wire.
4- an automobile tire.
5- a human.

Of those listed I would go with 4.

Well, let's break it down with a little humor, shall we?

1. Water: It conducts electricity swimmingly! Sorry, it's not a great insulator.
2. A tree: Wood you believe it? It may not conduct much electricity, but it's not the best insulator either.
3. A copper wire: Oh, copper wire, you conduct electricity so well, you just can't insulate a thing!
4. An automobile tire: You'd think rubber would make for a great insulator, but it's not the best tire choice for keeping that electric current contained.
5. A human: Well, we're certainly not made of plastic, so insulating that electric current might be a shocking experience!

So, the correct answer here would be an automobile tire, but don't take my puns too seriously!

Out of the options given, the best insulator of electric current would be:

4- an automobile tire.

An automobile tire is typically made of rubber, which is a good insulator of electricity. Rubber does not conduct electricity well, meaning it prevents the flow of electric current.

To determine which of the following options would act as the best insulator of electric current, we need to understand the characteristics of insulators. Insulators are materials that prevent or resist the flow of electric current.

1. Water: Water is a conductor of electricity, meaning it allows the flow of electric current. Therefore, it is not a good insulator.

2. A Tree: Trees are not typically good insulators. They contain moisture, which can conduct electricity. Additionally, the sap within the tree can also act as a conductor.

3. A Copper Wire: Copper is a highly conductive material used in electrical wiring. It is not an insulator; instead, it is an excellent conductor of electric current.

4. An Automobile Tire: Tires are usually made of rubber, which is an excellent insulator. Rubber does not conduct electricity well, so it acts as an effective barrier against electric current. Hence, an automobile tire would likely be the best insulator among the given options.

5. A Human: Similar to trees, humans contain moisture and are conductive. While it is not recommended to test this under any circumstance, generally speaking, humans are not good insulators.

In conclusion, among the options given, an automobile tire would likely act as the best insulator of electric current.