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level: Monitoring and measuring a.c.

Questions and Answers List

Question	Answer
what is the formula for frequency	f=1/T f is frequency in Hz T is period in seconds
what are the two types of current	direct current alternating current
describe direct current	the electrons flow in one direction through a conductor
describe alternating current	current that changes direction and instantaneous value with time
give examples of sources direct current is produced by	chemical cells batteries
give examples of sources alternating current is produced by	mains electricity
what will a graph of direct current against time look like?	...
what will a graph of alternating current against time look like	...
what is meant by peak current	the maximum value of current
what is meant by peak voltage	maximum value for potential difference
what is an r.m.s value?	root means square the alternating current equivalent of a direct current supply
what is the formula for peak/rms current	Irms=Ipeak/√2
what is the formula for peak/rms voltage	Vrms=Vpeak/√2
what does the time base setting on an oscilloscope tell us	the number of milliseconds it takes the trace to cross each box from left to right
what does voltage gain setting on an oscilloscope tell us	the number of volts each box represents in the vertical direction
what is the formula for frequency	f=1/T f is frequency in Hz T is period in seconds