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level: Introduction to electricity

Questions and Answers List

level questions: Introduction to electricity

Question	Answer
What is a cell?	Pushes current around a circuit
What equipment would the simplest cell consist of?	Cell, wire and bulb
What is a current?	Flow of charge
True/ false - The current leaving the cell is not equal to the current returning to the cell in this image due to ammeters.	False - The total amount of current that leaves the cell is equal to the current returning to the cell because the charges cannot be used up. The current is the same everywhere even is you put a million ammeters - they only measure the current.
True/ false - the current all around the circuit is the same	True
What is the equation for charge and current?	Charge = current x time
In the equation for charge and current, what is Q?	Charge
In the equation for charge and current, what is I?	Current
In the equation for charge and current, what is T?	Time
In the equation for charge and current, what is the unit for charge?	Coulombs
In the equation for charge and current, what is the unit for time?	Second
In the equation for charge and current, what is the unit for current?	Amps
If a current of 2A flows through a bulb for three minutes, what would the amount of charge that flows through the bulb be?	360C
If a current of 3A flows through a bulb for two hours, what would the amount of charge that flows through the bulb be?	21600
A charge of 5kC flows through a variable resistor in two hours. Calculate the reading of the device (which measures current), which is measured to the circuit? Give answer to one decimal place if necessary.	41.7A
A charge of 20 coulombs flows through a battery in 10 seconds. Work out the current flowing through the battery.	2A
A current of 3 A is flowing through a given point in an electric circuit. How much charge passes this point in two minutes?	360C
What would happen if	f
What is the equation for current resistance and potential difference?	Potential difference = current x resistance
The current flowing through a 5000000mΩ resistor is equal to X mA. If X measures 100C in 1/3 of a minute, calculate the potential difference across the resistor. Give answer to standard form with the unit. (DIFFICULT)	2.5 x 10^1 V
The potential difference across a diode is equal to 0.6 V, and the current through it is equal to 2 A. Calculate the resistance of the diode.	F
How many Ω is 1kΩ?	1000Ω
What is the equation for resistance?	R = V/I
To understand the potential difference we need to look back at our river analogy, but instead, this time we would do it side top. What happens as the river flow side top.	It GPE decreases, its KE increases