electricity Flashcards
when current flows past a point in a circuit for a length of time then the charge that has passed through is given by this formula
q=it
what does a fuse look like
a resistor with a horizontal line all the way through
what does a variable resistor look like
a resistor with a diagonal arrow through it
what does a diode look like
a circle with a line through it with a triangle and a lime next to it
what does an ldr look like
a circle with a rectangle box and lime through the middle with arrows pointing to it
what does a thermistor look like
a resistor with a diagonal line through it with a small line at the bottom
the ammeter is placed in:
and the voltmeter is placed in:
series
parallel
the formula linking potential difference and current is
v=ir
ohmic resistors have a … resistance
constant
the potential difference always adds up to an … source of of
equal
the total resistance of a circuit is
i=v/r
current is shared between…
branches
if you have 2 resistors in parallel their total resistance is less than the resistance of…
the smallest of the the two resistor
when you add resistors in parrallel the total current…so the total resistance….
increases
decreases
adding resistors in a series circuit …. the total resistance and …. the total current
increases
decreases
mains supply is
ac
battery supply is
dc
the live wire is
brown
the neutral wire is
blue
the earth wire is
green and yellow
live wires voltage is
230v
neutral wires voltage is
0v
earth wires voltage is
0v
your bodies voltage is
0v
energy transferred=
power (w) x time (s)
e=pt
power=
potential difference (v) x current (a)
throughout the day the electrical usage
fluctuates
