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Physics P5

Electrical Circuits

QuestionAnswer
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: 08burkeh