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Electricity
| Question | Answer |
|---|---|
| What is static Electricity | Static electricity involves electric charges that collect in one place and remain stationary |
| What are the Useful effects of static electricity | In spray painting, droplets of paint are charged, they are then attracted to the surface to be painted When a farmer is spraying, charged pesticide droplets are attracted to leaves |
| What are Annoying effects of static electricity | When you brush dry hair some hairs may repel each other and refuse to lie flat Objects (e.g. car windscreens) often attract dust when rubbed with a cloth |
| What are the Dangerous effects of static electricity | Static electricity can be very dangerous when there are inflammable liquids or gases around as it could cause the fuel to ignite and cause serious damage Lightning can be a dangerous result of static electricity |
| What are conductors | Conductors are substances that allow current to travel through them |
| What are insulators | Insulators are substances that do not allow current to travel through them |
| What is Current | Current is the flow of electrons in a circuit |
| What is The Unit for Currents | The unit for current is amps (I) |
| What is used to measure current | The instrument used to measure current is called an ammeter |
| What is Voltage | Voltage is the force (or pressure) that pushes the electrons |
| What is The Unit for Voltage | The unit for voltage is volts (V) |
| What is Resistance | Resistance is the opposing motion (slows down) of electrons |
| What is The Unit For Resistance | The unit for resistance is ohms(Ω) |
| What Instrument Is Used to measure resistance | The instrument used to measure resistance is called an ohmmeter |
| what happens in a series circuit | In a series circuit the electrons that go through one lamp (bulb) also go through the second lamp(bulb) |
| What Happens In A Parallel Circuit | In a parallel circuit the current from the battery gets split up |
| What is the relationship between Current and voltage | A straight line graph means that there is a direct relationship between the two variables, in this case, current and voltage. This means that as one increases, so does the other. They are directly proportional to one another. |
| What type of resistors are there | There are two types of resistors: Fixed resistors Variable resistors Fixed resistors have one value for resistance Variable resistors have different values for resistance |
| What is one example of a variable resistor | Light Dependent Resistor (LDR) – resistance varies with amount of light shone on it |
| what is the relationship between light intensity and resistance in an LDR (light dependent resistor) | Low light intensity = high resistance - this means a lot trying to stop the electrical current from flowing. High light intensity = low resistance - this means not a lot trying to stop the electrical current from flowing. |
| What is a Diode | A diode is a device that allows current to flow in one direction only |
| How Does The Electricity Triangle Look Like | V(v) I(a) R(Ω) |
| What is Power | Power is the amount of work done per unit time (as seen in the energy topic) |
| How Does The Power Triangle Look Like | W(j) P(w) T(s) |
| What is Used To Measure Power | A wattmeter is used to measure power |
| What is Power In Terms of Electricity | Power can also be seen as the rate at which energy is converted from one form to another |
Created by:
JMahango
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