Statistics for AQA - A Level Physics - Electricity #5

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Answer Stats

Hint	Answer	% Correct
How to calulcatie total resistance of resistors in parallel	1/RT=1/R1+1/R2...	0%
How does adding a resistor in parallel affect the total resistance	Always decreases the total resistance	0%
How does adding a resistor in series affect the total resistance	Always increases the total resistance	0%
What is found in a light sensing circuit?	A potential divider containing an LDR	0%
What is found in a temperature sensing circuit?	A potential divider containing a thermistor	0%
What is the behaviour of a lamp	As current increases, temperature and resistance increase significantly	0%
Kirchoff's First Law is based upon the conservation of...	Charge	0%
Give an application of a Diode	Converting AC to DC	0%
Rule for pd in series	Depends of the resistance of each component. gets shared across all of the components so V = V1+ V2...	0%
Rule for current in parallel	Depends on the total resistance of each loop	0%
Give an application of an LED	Efficient lighting	0%
The y-intercept of an output pd against current graph is equal to	EMF	0%
Kirchoff's Second Law is based upon the conservation of....	Energy	0%
How can you calculate the current supplied by a cell that has internal resistance	Equal to the EMF divided by the total resistance in the circuit (internal resistance + load resistance)	0%
Write equation for EMF in a circuit with one resistor and one cell with internal resistance	E = V + Ir so V = -Ir + E where y = mx + c	0%
The gradient of an output pd against current graph is equal to	Internal resistance, r	0%
Share of the total pd across each resistor in a potential divider is equal to	its share of the total resistance	0%
Give an application of an LDR	Light sensor e.g. streetlamps	0%
How to calulcatie total resistance of n identical resistors in series	n x R	0%
How does the power wasted by heating the internal resistance relate to the current?	Proportional to the square of the current being supplied	0%
What is the effect of connecting two identical resistors in series	Resistance is doubled	0%
What is the effect of connecting two identical resistors in parallel	Resistance is halved	0%
How to calulcatie total resistance of n identical resistors in parallel	R ÷ n	0%
Rule for pd in parallel	Same for each branch/loop	0%
Rule for current in series	Same for each component	0%
Give Kirchoffs 2nd law (PD circuit rule)	Sum of the EMFs is equal to the sum of the potential differences around a single loop	0%
How to calulcatie total resistance of resistors in series	Sum of the individual resistances	0%
Give an application of a Thermistor	Temperature sensor e.g. in a thermostat for controlling heating	0%
What is the total EMF of two cells that are connected the same way around	Their EMFs are added	0%
Define internal resistance	The opposition to current created by the charge carriers having to flow through the source of EMF	0%
If the resistance of a component in a potential divider falls what happens to the PD	The pd across it decreases	0%
Define lost volts	The pd dropped across the internal resistance	0%
The ratio of the pds in a potential divider is the same ratio as	the resistances	0%
As the current drawn from a source increases what happens to the PD	The terminal/output pd falls	0%
What is the total EMF If cells are connected in opposite directions	The total EMF is the difference between their EMFs. If they have the same magnitude EMF, the total EMF = 0	0%
Define terminal pd	The work done per unit charge supplied to the load resistance	0%
Give Kirchoffs 1st law (current circuit rule)	Total current entering a junction is equal to total current leaving a junction	0%
Describe a potential divider	Two or more resistors in series with a fixed source of EMF	0%