third form electric circuits
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What does p.d. stand for? | Potential Difference
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| Units of P.D.? | volts
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| Difference between cell and battery? | A battery is a group of cells.
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| Letter for P.D. in equations? | V
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| What units is current measured in? | amperes or amps (A)
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| Letter for current in equations? | I (capital eye!)
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| Which kind of circuit has only one path for the electric current? | a series circuit
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| Which kind of circuit has more than one track that the current can follow? | a parallel circuit
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| What are the units of resistance? | ohms
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| What Greek letter is used as a symbol for ohms? | omega
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| If the current is 2 A when the p.d. is 6 V, what is the resistance? | 6/2 = 3 ohms
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| A 2 ohm resistor and a 3 ohm resistor are connected in series. What is their total resistance? | 5 ohms.
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| A 2 ohm resistor and a 3 ohm resistor are connected in series. 4 amps flows through the 3 ohm resistor. What current flows through the other one? | The same, they are in series, 4 amps.
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| Three lamps are connected in series to the power supply. One burns out. What happens to the others? | They go out, the circuit is broken.
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| Three lamps are connected in parallel to the power supply. One burns out. What happens to the others? | They stay on, they each have their own circuit.
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| Name of component that only allows current to flow one way? | diode
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| Name of component that only allows current to flow one way and gives out light when current flows? | LED - light emitting diode
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| Name of component whose resistance gets smaller when it is hot? | thermistor
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| Name of component whose resistance is bigger when it is dark? | LDR, light dependent resistor
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| unit of charge? | coulombs
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| formula to calculate charge? | current in amps times time in seconds
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| A 2 ohm resistor and a 3 ohm resistor are connected in parallel. The PD across the 2 ohm resistor is 8 V. What is the p.d. across the 3 ohm resistor? | The same, they are in parallel, 8 volts.
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Created by:
waslancing
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