Unit 8

1. Materials that allow electricity to flow through them are called electrical _______________.
4. A _______________ is used to open or close a circuit.
5. The opposition of a material to the flow of electric current is called _______________.
7. Materials that do not allow electricity to flow through them are called electrical _______________.
8. A voltmeter is used to measure _______________.
9. The unit of electric current is _______________.
11. When a current flows through a coil, the coil acts like a magnet. It is called an _________________________.

2. An atom consists of a positively charged _______________ surrounded by negatively charged electrons.
3. The resistance of a _______________ can be changed.
4. In a _______________ circuit, the current is the same at every point in the circuit.
6. Electricity flows through a path called an electric _______________.
10. In a _______________ circuit, the current flowing in the main loop is the sum of the currents flowing in the branches.