Tutorial $3$

$15.$ Determine the voltage at each node with respect to ground in Figure $7-66.$

FIGURE $7-66$

$16.$ Determine the voltage at each node with respect to ground in Figure $7-67.$

$17.$ In Figure $7-67,$ how would you determine the voltage across $\backslash ($ R$\_\{2\}\backslash )$ by measuring without connecting a meter directly across the resistor?

$18.$ Determine the resistance of the circuit in Figure $7-66$ as seen from the voltage source.

$19.$ Determine the resistance of the circuit in Figure $7-67$ as seen from the voltage source.