physics notes ( chapter 11 )
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16 Terms
neutral object
equal number of electrons and protons
negatively charged object
more electrons than protons
positively charged object
less electrons than protons
like charges
repel
unlike charges
attract
electric current
rate of flow of electric charge
convectional current
flows from positive terminal of the battery
electrons flow
flow from negative terminal of the battery
electromotive force
work done by a source driving a unit around the circuit
series circuit total e.m.f
combined sum of individual battery cell
parallel circuit e.m.f
total sum of em.f is equal to one battery cell
potential difference
work done per unit charge in driving charges through the component
resistance
ratio of the potential difference to current flowing through it
resistor
a conductor that has high resistance
relationship between resistance and length
longer the wire length the higher the resistance
relationship between resistance and cross sectional area
the cross sectional area is doubled the resistance is cut by halved