Final answer:
By applying Ohm's law (V = IR), with I = 20 amps and R = 500 ohms, the voltage difference is calculated as 10,000 volts.
Step-by-step explanation:
To calculate the voltage difference in a circuit with a resistance of 500 ohms when the current is 20 amps, you can apply Ohm's law, which is V = IR, where V is voltage, I is current, and R is resistance.
Using the given values:
V = 20 A × 500 Ω = 10000 V
Therefore, the voltage difference in the circuit is 10,000 volts.