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Yr 9 Physics
| Question | Answer |
|---|---|
| What is energy | Energy is the ability to do work it can be kinetic energy or potential |
| What is kinetic energy and an example | energy of movement, examples - thermal, mechanical, eletrical, magnetic |
| What is potential energy and an example | stored energy, examples- chemical, elastic, nuclear, gravitational |
| How is energy measured | in Joules |
| What is static electricity | Static electricity is the transfer of electrical energy from one charged particle to another- build up of an electrical charge on a surface, Lightning is an example |
| What is in an atom | There is a nucleus with proton(positively charged) neutron(neutrally charged) and on the outer rings electrons negative charge |
| How does an atom become charged | Electrons on valent shells can be knocked, rubbed or pulled of the valent shell |
| What is an insulator | An insulator are materials that do not allow electrons to flow through them easily examples are rubber, plastic, glass- insulators can easily be charged by friction ( static electricity) |
| What is a conductor | A conductor is materials that easily allow electrons to flow through them easily examples are most metals ( conductors can not be easily charged by friction cause they can escape) |
| Charge law | Unlike charges attract, like charges repel |
| What is current electrictiy | the continuous movement of electrons through a conductor |
| What is voltage | Measured in volts - |
| What is resistance | Measured in ohms Ω |
| What is current | Current is measured in amperes ( A) |
| Ohm’s Law formula | V= IR |
| Rearranged formula to find I | I= V/R |
| Rearranged formula to find R | R=V/I |
| Define a series circuit | Series circuit is a circuit where the wires are connected end to end so the current has only one path to follow |
| Define a parallel circuit | A circuit in which the components are connected across common points or junctions, providing multiple paths for the current. |
| Advantage & Disadvantage of series circuits | Simple to design and build. BUT, If one component fails, the entire circuit stops working |
| Advantage & Disadvantage of parallel circuits | If one component fails, the rest of the circuit can still function. BUT, More complex to design and build compared to series circuits. |
| What is a resistor | Resistors: Components that limit or control the flow of electric current in a circuit. They convert electrical energy into heat.** |
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