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Physics P5
Electrical Circuits
| Question | Answer |
|---|---|
| When a object receives the electrons when it is electrically charged it becomes negative/positively charged? | Negatively charged |
| When a object gives up the electrons when it is electrically charged it becomes negative/positively charged? | Positively charged |
| What is static electricity? | A stationary electric charge, typically produced by friction |
| Do two materials with the same type of charge attract or repel each other? | Repel |
| Do two materials with different charges attract or repel each other? | Attract |
| What is an electric current? | A flow of charges |
| What is current measured in? | Amperes (Amps) |
| In a electric circuit are the charges used up? | No |
| What does the battery do to a electric circuit? | Causes the charges to move |
| What are the components and wires full of in a electric circuit? | Charges that are free to move |
| In metal conductors there are a few/lots of charges free to move. | Lots of |
| Are there any charges free to move in a insulator? | There are no charges free to move |
| What are the two types of current? | A direct current (d.c.) and an alternating current (a.c) |
| What is direct current? | Current that always flows in the same direction. |
| What supplies direct current? | Cells and batteries. |
| What is alternating current? | Current that changes direction of flow back and forth continuously. |
| What supplies alternating current? | Mains electric |
| What is the voltage of the mains electric supplied to you home? | 230 Volts |
| Why is alternating current used for mains supply instead of direct current? | It's easier to generate It can be distributed more efficiently Only alternating current can be used in a transformer. |
| What is potential difference another name for? | Voltage |
| What is potential difference? | The work done on or by per unit charge as it passes between two points in a ciruit. |
| What is potential difference measured in? | Volts (V) |
| What happens to the potential difference and current when you add more batteries in a parallel circuit? | They stay the same |
| What happens to the current supplied by each battery when you add more batteries in a parallel circuit? | Each battery supplies less current |
| The greater the resistance in a circuit the smaller/bigger the current will be. | Smaller |
| What happens in the wires as the current flows around a circuit? | The ions vibrate and collide with each other giving them energy |
| What does the increase in energy cause the component to do? | Heat up |
| How can you calculate resistance? | Resistance=Voltage/Current |
| How do you work out the voltage and current using the resistance formula? | By rearranging the formula |
| What does a diagonal straight line across a current-voltage graph mean about the relationship between voltage and current? | Current and voltage are directly proportional to each-other. |
| What happens to the resistance of a thermistor as the temperature increases? | The resistance decreases. |
| What happens to the current of a thermistor as the temperature increases? | More current flows. |
| What does the resistance of a LDR depend on? | Light intensity |
| What does LDR stand for? | Light dependent resistor |
| What happens to the resistance of a LDR as the light intensity falls? | The resistance decreases |
| What are thermistor's and LDR's examples of? | Components called resistors |
| When two components are connected in series to a battery what happens to the current flowing through each component? | It's the same |
| When two components are connected in series to a battery what happens to the potential difference in the circuit? | The potential difference across the components adds up to the potential difference across the battery |
| When two components are connected in series to a battery which component would have the most potential difference? | The component with the most reistance |
| In parallel circuits with one component per parallel path, what happens to the current flowing though each component? | The current depends on the resistance of each component |
| In parallel circuits with one component per parallel path, what does the total current running from and to the battery equal? | The sum of the current through each of the parallel components. |
| In parallel circuits with one component per parallel path, when is the current at its greatest? | Through the component with the smallest resistance. |
Created by:
vahajuddin
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