91影视

In Figure, the ideal batteries have emfs${\mathbf{\text{蔚}}}_{\mathbf{\text{1}}}\mathbf{=}\mathbf{10}\mathbf{.0}\mathbf{\text{V}}$and${\mathit{蔚}}_{\mathbf{2}}\mathbf{=}\mathbf{0}\mathbf{.500}\mathbf{}{\mathit{蔚}}_{\mathbf{1}}$ , and the resistances are each $\mathbf{4}\mathbf{.00}\mathit{惟}$.

(a) What is the current in resistance 2?

(b) What is the current in resistance 3?

In Figure, the ideal batteries have emfs ${\mathit{蔚}}_{\mathbf{1}}\mathbf{=}\mathbf{5}\mathbf{.0}\mathbf{\text{鈥塚}}$and ${\mathit{蔚}}_{\mathbf{1}}\mathbf{=}\mathbf{5}\mathbf{.0}\mathbf{\text{鈥塚}}$, the resistances are each $\mathbf{2}\mathbf{.0}\mathbf{\text{鈥坝�}}$, and the potential is defined to be zero at the grounded point of the circuit. What are potentials

(a) What are potential $V_1$at the indicated points?

(b) What are potential ${\mathit{V}}_{\mathbf{2}}$at the indicated points?

Both batteries in Figure

(a) are ideal. Emf${蔚}_1$ of battery 1 has a fixed value, but emf ${\mathit{蔚}}_{\mathbf{1}}$of battery 2 can be varied between $\mathbf{\text{1.0V}}$and$\mathbf{\text{10V}}$ . The plots in Figure

(b) give the currents through the two batteries as a function of${\mathit{蔚}}_{\mathbf{2}}$ . The vertical scale is set by is${\mathit{i}}_{\mathbf{s}}\mathbf{=}\mathbf{0}\mathbf{.20}\mathbf{\text{A}}$ . You must decide which plot corresponds to which battery, but for both plots, a negative current occurs when the direction of the current through the battery is opposite the direction of that battery鈥檚 emf.

(a)What is emf${\mathit{蔚}}_{\mathbf{1}}$ ?

(b) What is resistance${\mathit{R}}_{\mathbf{1}}$ ?

(c) What is resistance ${\mathit{R}}_{\mathbf{2}}$?

Question: In Figure, the current in resistance 6 isi₆ =1.40 Aand the resistances are ${\mathbf{R}}_{\mathbf{1}}\mathbf{=}{\mathbf{R}}_{\mathbf{2}}\mathbf{=}{\mathbf{R}}_{\mathbf{3}}\mathbf{=}\mathbf{2}\mathbf{.}\mathbf{00}\mathbf{惟}\mathbf{,}{\mathbf{R}}_{\mathbf{4}}\mathbf{=}\mathbf{16}\mathbf{.}\mathbf{0}\mathbf{惟},{\mathbf{R}}_{\mathbf{5}}\mathbf{=}\mathbf{8}\mathbf{.}\mathbf{00}{\mathbf{惟补苍诲搁}}_{\mathbf{6}}\mathbf{=}\mathbf{4}\mathbf{.}\mathbf{00}\mathbf{惟}\mathbf{.}$What is the emf of the ideal battery?

The resistances in Figures (a) and (b) are all $\mathbf{}\mathbf{6}\mathbf{.0}\mathit{惟}$ , and the batteries are ideal $\mathbf{\text{12V}}$batteries. (a) When switch S in Figure (a) is closed, what is the change in the electric potential ${\mathit{V}}_{\mathbf{1}}$ across resistor 1, or does ${\mathit{V}}_{\mathbf{1}}$ remain the same?

(a) When switch S in Figure (b) is closed, what is the change in $V_1$across resistor 1, or does $V_1$ remain the same?

In Figure,$\mathit{蔚}\mathbf{=}\mathbf{12}\mathbf{\text{鈥塚}}$, ${\mathit{R}}_{\mathbf{1}}\mathbf{=}\mathbf{2000}\mathbf{\text{鈥�}}\mathbf{}\mathbf{\text{惟}}$, ${\mathit{R}}_{\mathbf{2}}\mathbf{=}\mathbf{3000}\mathbf{\text{鈥�}}\mathbf{}\mathbf{\text{惟}}$, and ${\mathit{R}}_{\mathbf{3}}\mathbf{=}\mathbf{4000}\mathbf{\text{鈥�}}\mathbf{}\mathbf{\text{惟}}$. (a) What is the potential difference ${\mathit{V}}_{\mathbf{A}}\mathbf{鈭�}{\mathit{V}}_{\mathbf{B}}\mathbf{?}$(b) What is the potential difference ${\mathit{V}}_{\mathbf{B}}\mathbf{鈭�}{\mathit{V}}_{\mathbf{C}}\mathbf{?}$(c) What is the potential difference${\mathit{V}}_{\mathbf{C}}\mathbf{鈭�}{\mathit{V}}_{\mathbf{D}}\mathbf{?}$(d) What is the potential difference ${\mathit{V}}_{\mathbf{A}}\mathbf{鈭�}{\mathit{V}}_{\mathbf{C}}\mathbf{?}$

In Figure, $\mathbf{}{\mathit{蔚}}_{\mathbf{1}}\mathbf{=}\mathbf{6}\mathbf{.00}\mathbf{\text{V}}$, ${\mathit{蔚}}_{\mathbf{2}}\mathbf{=}\mathbf{12}\mathbf{.0}\mathbf{\text{V}}$ ,${\mathit{R}}_{\mathbf{1}}\mathbf{=}\mathbf{100}\mathit{惟}$ , ${\mathit{R}}_{\mathbf{2}}\mathbf{=}\mathbf{200}\mathit{惟}$ ,and${\mathit{R}}_{\mathbf{3}}\mathbf{=}\mathbf{300}\mathit{惟}$ . One point of the circuit is grounded$\mathbf{(}\mathbf{V}\mathbf{=}\mathbf{0}\mathbf{)}$ .(a)What is the size of the current through resistance 1? (b) What is the direction (up or down) of the current through resistance 1? (c) What is the size of the current through resistance 2?(d) What is the direction (left or right) of the current through resistance 2? (e) What is the size of the current through resistance 3? (f) What is the direction of the current through resistance 3? (g) What is the electric potential at point A?

Question: In Figure, the resistances are,${\mathbf{R}}_{\mathbf{1}}\mathbf{=}\mathbf{2}\mathbf{.}\mathbf{00}\mathbf{惟}$,${\mathbf{R}}_{\mathbf{2}}\mathbf{=}\mathbf{5}\mathbf{.}\mathbf{00}\mathbf{惟}$ and the battery is ideal. What value of R₃maximizes the dissipation rate in resistance 3?

The figure shows a section of a circuit. The resistances are $\mathbf{}{\mathit{R}}_{\mathbf{1}}\mathbf{=}\mathbf{2}\mathbf{.0}\mathit{惟}$ , ${\mathit{R}}_{\mathbf{2}}\mathbf{=}\mathbf{4}\mathbf{.0}\mathit{惟}$and ${\mathit{R}}_{\mathbf{3}}\mathbf{=}\mathbf{6}\mathbf{.0}\mathit{惟}$, and the indicated current is $\mathit{I}\mathbf{=}\mathbf{6}\mathbf{.0}\mathbf{\text{A}}$ . The electric potential difference between points A and B that connect the section to the rest of the circuit is ${\mathit{V}}_{\mathbf{A}}\mathbf{鈭�}{\mathit{V}}_{\mathbf{B}}\mathbf{=}\mathbf{78}\mathbf{\text{V}}$ . (a) Is the device represented by 鈥淏ox鈥� absorbing or providing energy to the circuit, and (b) At what rate?

In Fig. 27-50, two batteries with an emf$\mathit{蔚}\mathbf{=}\mathbf{12}\mathbf{.0}\mathbf{\text{鈥塚}}$and an internal resistance $\mathit{r}\mathbf{=}\mathbf{0}\mathbf{.200}\mathbf{\text{鈥坝�}}$are connected in parallel across a resistance R. (a) For what value of Ris the dissipation rate in the resistor a maximum? (b) What is that maximum?