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level: Level 1

Questions and Answers List

level questions: Level 1

Question	Answer
an electrical current heats the filament in a bulb so that it gives out light	what happens in a lamp?
a fixed resistor has a resistance that does not change and a variable resistor can change resistance	what is a fixed and variable resistor?
it allows current to flow through only one direction	what is a diode?
the flow of electrons is consistently in one direction around the circuit	what is direct current?
the direction of electron flow continually reverses	what is an alternating current?
electrons are negatively charged particles and they transfer energy through wires as electricity	what are electrons?
current is the flow of electrical charge	what is current?
Q=It	what links current time and charge?
in series	where must the ammeter always be placed?
both the resistance of the component and the potential difference across the component	what does the current through a component depend on?
in parallel with the component	where must the voltmeter be placed?
E=QV	what links potential difference energy and charge?
V=IR	what links potential difference current and resistance?
---	length of wire practical
----	investigating current practical
..	draw results for an ohmic
same current v1=v2=v3	current in a series
v2=v1+v1	potential difference in series
rtotal= r1+r2	resistance in series
the same	potential difference in parallel circuits
split between the loops	current in parallel circuits
jj	investigate resistor networks
As electrons flow through wires, they collide with the ions in the wire which causes the ions to vibrate more. This increased vibration of the ions increases the temperature of the wire.	how do wires heat up