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Description
Flashcards by Malachy Moran-Tun, updated more than 1 year ago
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Created by Malachy Moran-Tun
over 4 years ago
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| Question | Answer |
| i'm assuming you know circuit symbols | k cool :) |
| What is Current? | Flow of Electrical Charge |
| What Unit is Current Measured in? | Amps / Amperes (weirdos) / A |
| What is Potential Difference? | Voltage "Driving force" that pushes the charge around |
| What Unit is Potential Difference Measured in? | Volts / V |
| What is Resistance? | Anything that slows the flow of current down |
| What is Resistance Measured in? | Ohms / Ω |
| How can a Current Flow in Metals? | Delocalised Electrons in the Lattice of Positive Ions |
| What Equation Links Charge, Time and Current | Charge (C) = Current (A) × Time (s) Q = It |
| What Equation Links Charge Moved, Potential Difference and Energy Transferred? | Energy Transferred (J) = Charge Moved (C) × Potential Difference (V) E = QV |
| What Equation Links Potential Difference, Resistance and Current? | Potential Difference (V) = Current (A) × Resistance (Ω) V = IR |
| Generally, what does Temperature do with Resistance in Electrical Circuits? | Increase it |
| Why does Temperature affect Resistance in Electrical Circuits? | The more thermal energy, the more vibrations (kinetic energy) in the particles If particles are vibrating more, it's harder for the delocalised electrons to move through More collisions with electrons and ions |
| Voltage and Current Practical in Guide of Revisions | coooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooool |
| Graphs of Circuit Devices in Guide where you can Revise from if you so wish | ye |
| What is an LDR and what happens to its Resistance? | Light Dependent Resistor. Bright light - resistance falls Darkness - resistance increases |
| What is a Thermistor and what happens to its Resistance? | Temperature Dependent Resistor Hotter - resistance decreases Cooler - resistance increases |
| Revision guide for LDR investigation, fairly self explanatory tho | indeed it is, other side of the card |
| What is a Series Circuit? | A circuit in which all components are connected in a line, end to end If you disconnect one component, the whole circuit is broken |
| In a Series Circuit, what does Adding Resistors do? | Increase the Total Resistance across the Circuit |
| What is a Parallel Circuit? | A circuit in which each component is separately connected If you disconnect one component, others would not be affected (most likely) |
| True / False Potential Difference in Parallel Circuits is the same all around | True |
| True / False Current in Parallel Circuits is the same all around | False The current is shared between the branches The total current is equal to the total of all currents through the separate components Current changes at junctions |
| What happens to Parallel Circuits when a Resistor is Added? | Resistance decreases |
| more practical stuff wow i definitely got to do this because of covid yeah | totally 100% |
| What Equation Links Energy Transferred, Potential Difference, Time and Current? | Energy Transferred (J) = Current (A) × Potential Difference (V) × Time (s) E = IVt |
| What are some Examples of Appliances that Use Thermal Energy? | > Toaster > Kettle > Electric Heaters > other stuff (wow really?) |
| What Equation Links Time, Power and Energy Transferred? | Power (W) = Energy Transferred (J) ÷ Time (s) P = E ÷ t |
| What Equation Links Current, Power and Potential Difference? | Power (W) = Current (A) × Potential Difference (V) P = IV |
| What Equation Links Current, Power and Resistance? | Power (W) = Current² (A) × Resistance (Ω) P = I² × R |
| What is an AC Power Supply and Give a Common Example? | AC - Alternating Current Movement of the charges is constantly changing direction (like a wave) UK Mains Supply is AC |
| What is an DC Power Supply and Give a Common Example? | DC - Direct Current Movement of the charges is only in one direction Batteries are DC |
| What Voltage and Frequency is the AC UK Mains Power Supply? | 230 V 50 Hz |
| plug diagram in revision guide | eeeeeeeeeeeeee |
| Why am i able to stick a fork in a plug socket and give me a nice tingle known as an electric shock? | > Body is at 0 V > Touching a live wire creates a large voltage - current flows > Low resistance path to Earth causes a huge current to flow |
| How do Fuses Work? | > Small amount of metal in a glass tube > Metal melts if the temperature gets too hot (due to a high current) > Needs to be replaced |
| What is a Circuit Breaker? | Like a fuse, but faster and does not need to be replaced |
| What Fuse Rating is Necessary for Electrical Appliances? | The rating as near as possible but HIGHER than normal operating current |
| yay done | go drin k watrer |
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