In the circuit shown, the battery provides a current I = 0.3 A to the resistor. How much current is returned by the resistor to the negative terminal of the battery? How much current flows inside the battery from the negative to the positive terminal?
Estimate the resistance of a typical electrical cord in your home, say, one that attaches a lamp to the wall socket.
According to your textbook, the power dissipated by a resistor is given by P = V2/R. However, your textbook also says that the power dissipated by a resistor is given by P = I2R. Is the power really proportional to R or is it really proportional to 1/R? Can both be correct?
Estimate the resistance of a typical lightbulb. Hint: You can use "typical" values for the voltage and power.
