True or false? (a) Adding more resistance to a circuit increases its resistance. (b) Removing resistance from a circuit decreases its resistance. Justify your answers with simple examples.
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- How does the resistance of a wire depend on its radius? Explain your answer.In the circuit shown in the figure all resistors are 5 ohm resistors and the source EMF is 12 volts. (a) Calculate the equivalent resistance of the circuit below when the switch is (1) open (2) closed. (b) Calculate the Power in Rg and the current in R4 if the switch is (1) Open (2) Closed R1 si ww R2 R3 R5 R46. An electrical circuit is shown below. The battery supplies 15 V. The resistances have the following values: R₁= 30 Ω, R₂ = 40 Ω, R3 = 20 Ω . (a) Calculate the replacement resistance of the three resistors. (b) Calculate the total current through the circuit, and the current through the respective resistor (c) If the lower right corner is grounded, then calculate the potentials at points A and B. (d) If the current is interrupted at point C, what will be the potentials at A and B.
- Two resistors with values of 45 Ω and 50 Ω, respectively, are connected in series and hooked to a 12 V battery. (a) How much current is in the circuit? (b) How much power is expended in the circuit?When using an ammeter to measure current: Group of answer choices open the circuit at the positive and negative terminals of the battery. open the circuit and connect the meter in series between the two open ends. open the circuit at one point and connect the meter to one end. connect the meter across the battery or load.- In the circuit, the potential difference across the battery is 18 V. V1 is 7.0 V and R2 = 30.0 Ω.a) Calculate the values of R1, V2, and the current through the circuit. (b) How long will it take for 12 C of charge to pass through the circuit?