P6 Flashcards
Power(P) = ?
Voltage(V) x Current(I)
R total = R1 +R2
What does R1 represent?
the first resistance in series circuit
1/R1 + 1/R2 = ?
1/R total
What is the formula for total resistance in a parallel circuit?
1/R total = 1/R1 + 1/R2
Resistance formula
R=V/I
What is the Ohm’s Law formula?
R=V/I
I=Q/t
What does Q represent in this formula?
Q = charge
What is the formula for power?
Power = energy transferred/time x voltage x current
Energy transferred electrically =
IVt
What does p.d. stand for?
Potential Difference
Define a series circuit
Only one way round the circuit
Define a parallel circuit
Two or more components attached along separate branches of the circuit
As more light bulbs are added in series, the current __________.
decreases
As more light bulbs are added in series, the potential difference(voltage) across each bulb _________.
decreases
Current is the _____ everywhere in a series circuit.
same
The voltage in a series is _____ amongst the different components.
split
In a parallel circuit, _____ in each branch is the same as the power supply.
p.d.
In a parallel circuit, _____ splits as it goes into ________ branches.
current, different
What happens to the temperature of a thermistor as the resistance increases?
Temperature also increases
What is the relationship between light intensity and LDR resistance?
As light increases, LDR resistance decreases.
What is the symbol for ohm(unit for electrical resistance)?
Ω
What kind of appliances draw the biggest currents?
Things that use heat tend to draw bigger currents.
Name the 3 main dangers of electricity
- Damaged insulation
- Overheating of wires
- Damp conditions
Damaged insulation
Exposed wires can cause electric shots if we touch them accidentally.
Overheating of wires
e.g. too many appliances plugged into the same extension cord
-> can cause overheating + potential fire hazard
Damp conditions
Water can conduct electricity and many cause electric shocks, if splashed onto exposed wires.
