Mphisto said:
ehild said:
To calculate total resistance in a circuit, you need to add up all the individual resistances. This can be done using the formula: Rtotal = R1 + R2 + R3 + ... where R1, R2, R3, etc. are the individual resistances.
Resistance is measured in units called ohms (Ω). This is represented by the Greek letter omega (Ω). Other units of measurement for resistance include kilohms (kΩ) and megohms (MΩ).
No, resistance cannot be negative. It is always a positive value. However, in some cases, the direction of current flow can be opposite to the direction of conventional current flow, resulting in a negative value for voltage. This is known as a polarity change and does not indicate negative resistance.
In a parallel circuit, the total resistance decreases as more branches are added. This is because the individual resistances are divided by the total number of branches. The total resistance can be calculated using the formula: 1/Rtotal = 1/R1 + 1/R2 + 1/R3 + ...
If the resistors are not in a series or parallel configuration, you can use the equivalent resistance formula: Req = √(R12 + R22 + R32 + ...). This formula can be used for any number of resistors in any configuration.