Question

(8%) Problem 11: In order to measure the properties of a battery, several resistors are connected to the battery in series and the terminal voltage is measured. In the first case, the resistor has resistance R? = 5.5 ? and the terminal voltage is ?V? = 4.6 V. In the second case, the resistor has resistance R? = 72 ? and the terminal voltage ?V? = 6.5 V. 20% Part (a) Express the current through a battery I using the voltage across the terminal ?V and the resistance of the circuit R. I = ?V/R 20% Part (b) Express the emf of the battery using the variables for current I, internal resistance r, and external resistance R. ? = I(R + r) 20% Part (c) Express the emf in terms of r, R and ?V. ? = ?V / R ( R + r ) 20% Part (d) Find the numerical value of r in ?. r = 20% Part (e) Find the numerical value of ? in V.

          (8%) Problem 11: In order to measure the properties of a battery, several resistors are connected to the battery in series and the terminal voltage is measured. In the first case, the resistor has resistance R? = 5.5 ? and the terminal voltage is ?V? = 4.6 V. In the second case, the resistor has resistance R? = 72 ? and the terminal voltage ?V? = 6.5 V.

20% Part (a) Express the current through a battery I using the voltage across the terminal ?V and the resistance of the circuit R.
I = ?V/R

20% Part (b) Express the emf of the battery using the variables for current I, internal resistance r, and external resistance R.
? = I(R + r)

20% Part (c) Express the emf in terms of r, R and ?V.
? = ?V / R ( R + r )

20% Part (d) Find the numerical value of r in ?.
r =

20% Part (e) Find the numerical value of ? in V.

(8%) Problem 11: In order to measure the properties of a battery, several resistors are connected to the battery in series and the terminal voltage is measured. In the first case, the resistor has resistance R? = 5.5 ? and the terminal voltage is ?V? = 4.6 V. In the second case, the resistor has resistance R? = 72 ? and the terminal voltage ?V? = 6.5 V.

20% Part (a) Express the current through a battery I using the voltage across the terminal ?V and the resistance of the circuit R.
I = ?V/R

20% Part (b) Express the emf of the battery using the variables for current I, internal resistance r, and external resistance R.
? = I(R + r)

20% Part (c) Express the emf in terms of r, R and ?V.
? = ?V / R ( R + r )

20% Part (d) Find the numerical value of r in ?.
r =

20% Part (e) Find the numerical value of ? in V.

Added by Jennifer M.

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