Question

1. Experiment: Create a series circuit with a 20-volt battery and four 20-ohm resistors, as shown. Measure the current.
Based on the voltage and current, what is the resistance of the circuit?

(Hint: Use Ohm’s law.)

Answer 1

Ohm's law states that V = IR, where V is voltage, I is current, and R is resistance.

Given:
Voltage (V) = 20 volts
Resistance (R) = 20 ohms (each resistor has 20 ohms, and there are four in series, so the total resistance is 4*20 = 80 ohms)

From Ohm's law:
V = IR
20 = I * 80

Therefore, I = 20/80 = 0.25 amperes

So the current in the circuit is 0.25 amperes.