Final answer:
The five tests of a fixture involve checking if substances like plastic, metal, wood, etc., are electrical conductors by observing a circuit with a light bulb and clips. Calculations involving resistance and concave mirrors in fixtures like heat lamps can also be part of these tests.
Step-by-step explanation:
The five tests of a fixture often involve assessing the ability of substances to conduct electricity. One common method to determine if a substance is an electrical conductor is by performing a simple test that includes a circuit with a light bulb and crocodile clips. For example, if test substances like a piece of plastic, an aluminum can, a metal pencil sharpener, a magnet, wood, chalk, and cloth are placed between the clips, the light bulb's response can indicate whether electricity passes through the material, which in turn reveals if the substance is a conductor.
Students can also study the impact of fixtures in electrical circuits, like a heat lamp, by calculating the resistance needed in each filament to achieve a specific light intensity on a bathroom floor. Such problems may also involve utilizing concave mirrors to focus the light more efficiently. Lastly, when examining circuit setups, testing points with the same potential can help to verify the proper functioning of the circuit and identify any electrical conductors within.