1) The terminal voltage of a current is observed to change when
the battery supplies a current to an external resistor. What
quantities are needed to calculate the change in voltage?
a) The battery's emf and its internal resistance
b) The battery's emf and the current
c) The current and the internal resistance of the battery
d) The current and the external resistance
2)For an electron beam, the following quantities are
known:
Area A when beam hits a target
Beam current I
Accelerating potential difference V
Elementary charge on electron
Write an expession that gives the rate of arrival of electrons per
unit area on the target based on the quantities given above.