If a positive charge is placed at point 1, sketch the Electric Force Field lines around the two charges. If a negative charge is placed at point 2, sketch the Electric Force Field lines around the two charges. Conductors have low electrical resistivities. Insulators have high electrical resistivities. The unit of electric potential difference is the volt .
Electric current is the rate that charge moves through a circuit.
When things heat up, they glow. Motions of individual electrons through wire are intermittent. Resistance of bulb filament like a steep hill. For a given voltage, the lower the resistance, the greater the current. The lower the resistance to electric current, the greater the current, and the greater the power delivered.