P4 electric circuits
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16 Terms
why do insulating materials become charged when rubbed together
one insulating material has a positive charge when it loses electrons, another insulator has a negative charge when it gains electrons
what is a non contact force
the force between two charged objects
what does an ammeter do
measures electric current
what does a voltmeter do
measures potential difference (voltage)
what does a diode do
allows current through in one direction only
what does a fuse do
breaks the circuit if the current is too great
what is a battery
two or more cells connected together
what does a fixed resistor do
limits the current in a circuit
what does a indicator do
emits light as a signal when a current passes through it
what is Ohm’s law
the current through a resistor at a constant temperature is directly proportional to the potential difference across the resistor
what happens when you reverse the potential difference across a resistor
it reverses the current through it
what happens when a filaments lamp’s resistance increases
the filaments temperature increases
what is a series circuit
the current is the same across each component, the total potential difference is shared between the components, adding their resistances gives the total resistance
what happens when you add more resistors to a series circuit
increases the total resistance
what is a parallel circuit
the total current is the sum of the currents through the separate components, the potential difference across each component is the same
what happens when you add more resistors to a parallel circuit
decreases the total resistance
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Flashcards (30)