Question

a 15.0k resistor is hooked up to 45.0v battery in a circuit with a switch a.) Draw a circuit diagram for the circuit described. Label all parts and values. b.) What is the current flowing through the resistor? c.) What is the power dissipated by the resistor?

Answer 1

For item#1 , see attached picture, there is a voltage source, a resistor and wire (where current flow).

For item#2, we use the formula V=IR where "V" is for the voltage, "I" is for the current and "R" for the resistance
Solving for I:
I = v/r
I = 45volts/15k ohms
I=3 mA

For item#3, power is P=VI 
p = 45volts * 3ma
P = 0.135 Watts