electricity Flashcards
james rubs a balloon on a wall and it sticks. why?
the electrons move from the balloon to the wall. the extra electrons the wall attract the protons in the balloon so the balloon sticks.
true or false. electrons are destroyed when friction happens
false the electrons are transferred from one object to another
true or false. insulators block out electrons
false. electrons still flow through it but not as much for it to conduct
what is the current
the flow or charge around a circuit
what are the 3 things needed in a circuit
energy supply, component(s), conductors connecting everything
what is resistance
a property of a component that works against the current and makes it difficult for charge to pass through it
just learn this information and mark it red so it comes up a lot until you have learnt it
what does resistance equal
the higher the ________ the lower the ________
higher the resistance, the lower the current.
resistance = voltage / current
calculate the resistance.
a lamp has a current of 2A when connected to a 12V power supply
12 / 2 = 6Ω
calculate the potential difference.
a motor has a resistance of 50Ω and runs at a current of 90A.
4500Ω
what happens to the resistance if you double the length of a conductor
it doubles
what is the different between current and voltage (potential difference)
current = the flow of electricity
voltage= the
define a series circuit
made of one continuous loop
how many components can a series circuit have
there is no limit
how does the current change in a series circuit? why?
no matter where is the circuit, the current wont change. this is because there is only one path for the current to follow
how does the voltage change in a series circuit? why?
the voltage is shared in a series circuit. this is because each component diminishes the energy as it passes through the loop
define a parallel circuit
components are connected in multiple smaller loops
how does the current change in a parallel circuit?
the current is shared between the branches
fill in the blanks;
the [_____(A)___ _________] in a parallel circuit = the potential difference produced by the [_______(B)______]
A= potential difference
B= power source
