Charge Carrier - a moving charge. Current Density J - in the conductor is defined as the current per unit area. Terminal Voltage - will be less than the emf due to internal resistance of the battery in a simple DC circuit. The current I depends on the value of the emf of the source, the load resistance of the circuit, and the internal resistance of the source. Current remains the same.
Potential difference remains the same.
Kirchoff's Rules - 1. The sum of the currents entering a junction in the circuit must equal the sum of the currents leaving a junction of the circuit, or summation all I in equals summation all I out. The sum of the potential differences across all elements of any closed loop equals zero. Any capacitor acts as an open circuit, meaning the current in the branch containing the capacitor is zero under steady state conditions. Gauss's Law - net magnetic flux through any closed surface is zero.