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Sci. Ch 6 Unit Test
9th grade Physical Sci. Unit Test
| Question | Answer |
|---|---|
| is individual batteries. | Dry Cell |
| a piece of metal that bends. | Circuit Breaker |
| no current flows in this circuit. | Open Circuit |
| a small piece of wire that melts. | Fuse |
| tenancy of a material to oppose the flow of electrons. | Resistance |
| A circuit that has two or more separate branches for current is a____. | Parallel Circuit |
| The statement current is equal to the voltage difference divided by the resistance is known as______. | Ohm's Law |
| A path that allows only one route for a current is called_____. | Series Circuit |
| The rate at which an electrical device converts energy from one form to another is called______. | Electrical Power |
| Resistance is measured in units called the_____. | Ohm |
| Electric charge that has accumulated on an object is referred to as_______. | Static Electricity |
| A static discharge differs from an electric current in that a static discharge_____. | Last for a fraction of a second |
| Which of the following is the correct relationship among power current and voltage. | P=I(V) V=P/I I=P/V (1 of these) |
| A television that requires an average of 0.5amp of current is operated on a 120V service for 10h. How much energy is used. | 0.6=kW |
| Which of the following is a device designed to open an overloaded circuit and prevent overheating. | Circuit Breaker |
| The voltage______as current moves through a circuit. | Varies |
| Lightning is_______. | Very large discharge Static Electricity |
| One source of constant electric current is a______. | Dry Cell |
| A Material through which electrons do not move easily is an_____. | Insulator |
| Measurement | Unit | Symbol (Chart) | (Resistance , Ohm, Ohm symbol) (Electrical Energy, Kilowatt hour, KWH) (Electrical Power, Kilowatts, kW) (Voltage Difference, Volts, V) (Electric Current, Amperes, A) |
| Electroscope (Chart) What is the name of the instrument in the figure of the diagram? | Electroscope |
| Electroscope (Chart) Describe the apiaries of the leaves in figure one. | The leaves are spread apart |
| Electroscope (Chart) Describe the leaves in figure two. | Hang down |
| Electroscope (Chart) What inference can you make about the electrical conditions about the comb in figure one and two. | There is a neutral charge in figure two and a electrical charge in figure one |
| Electrical wire sometimes has a plastic coating rapped around them. How does this make the wires safer to handle? | Plastic is a good insulator |
| Why is lithium atom electronically neutral? | Number of neutrons equals the number of protons |
| What is the electrical current passing through this ammeter. | In a Chart |
| Which of these devices provides safety in an electric circuit. | Circuit breaker |
| Most of the electrical energy used by a toaster is converted to____. | Heat energy |
| Mr. Robinson and his 7th grade science class are conducting an experiment. The class needs to choose a good insulator of which of the following would be a good insulator. | Plastic Plate |
| Which of the following would make spoons repel each other | If they are both negatively charged (a. and b.) |
| Which of the following instruments would be used to measure electric energy usage. | Kilowatt hours |
Created by:
P.V.A.