Circuit voltage calculation problem Circuit... The power comes out and slides two pieces in the rheostat. One slide piece comes out and connects to the constant value resistor, the other resistance wire comes out and connects to the switch s, and then connects to the negative pole Constant resistance 80 Ω Sliding rheostat 240 Ω max Supply voltage 9.6V When the switch is off, the sliding rheostat will change from the minimum resistance to the maximum resistance, and the voltage at both ends of the resistor will change from? V to? V What happens when the switch is closed?

Circuit voltage calculation problem Circuit... The power comes out and slides two pieces in the rheostat. One slide piece comes out and connects to the constant value resistor, the other resistance wire comes out and connects to the switch s, and then connects to the negative pole Constant resistance 80 Ω Sliding rheostat 240 Ω max Supply voltage 9.6V When the switch is off, the sliding rheostat will change from the minimum resistance to the maximum resistance, and the voltage at both ends of the resistor will change from? V to? V What happens when the switch is closed?

It is a series circuit
therefore
When the switch is disconnected, the sliding rheostat will change from the minimum resistance value of 0 Ω to the maximum resistance value of 240 Ω, and the voltage at both ends of the constant resistance will change from 0V to 0V
When the switch is closed, the minimum resistance of the sliding rheostat is 0 Ω to the maximum resistance of 240 Ω, and the voltage at both ends of the constant resistance is 9.6V to 2.4V

Calculation of the ratio of voltage, resistance, power to current
In series, R1 / r2 = U1 / U2 = P1 / P2
In parallel, R1 / r2 = I2 / I1 = P2 / P1

A lamp connected to a constant voltage power supply, its power is 100W, if the lamp is connected to a long wire, and then connected to the same power supply, the known power loss on the wire is 9W, then the actual power consumption of the lamp is R1 meter R lamp, R2 meter R line P. similarly, R1: R2 = P1: P2 (I ^ R available) R1 = u ^ / 100, R2

An applied problem about resistance voltage and current
There are two transmission lines between a and B, 20 kilometers apart. The resistance of the transmission line is 0.01 ohm per meter. Now the transmission line has a short circuit somewhere. In order to determine the location of the short circuit, the maintenance personnel use the voltmeter and ammeter to form a circuit with the power supply. When the voltage is 1.5V and the current is 30mA, how many kilometers is the short circuit location from a?

1.5/0.03/0.01/2=2500=2.5KM