This circuit contains batteries and resistors. You may assume that the batteries have negligible internal resistance.

 Use Kirchhoff's first law to find the current in the $4.00 \mathrm{\Omega }$ and $8.00 \mathrm{\Omega }$ resistors.

 

 

This circuit contains batteries and resistors. You may assume that the batteries have negligible internal resistance.

Calculate the e.m.f. of $E_1$.

This circuit contains batteries and resistors. You may assume that the batteries have negligible internal resistance.

Calculate the value of$\mathit{ }{E}_{\mathit{2}}\mathit{.}$

This circuit contains batteries and resistors. You may assume that the batteries have negligible internal resistance.

Calculate the current in the$12.00 \mathrm{\Omega }$ resistor.

Explain why an ammeter is designed to have a low resistance.

 A student builds the circuit, as shown, using a battery of negligible internal resistance. The reading on the voltmeter is $9.0 \mathrm{V}.$

The voltmeter has a resistance of $1200 \mathrm{\Omega }$. Calculate the e.m.f. of the battery. 

 A student builds the circuit, as shown, using a battery of negligible internal resistance. The EMF of cell is $12V$.

The voltmeter has a resistance of $12 \mathrm{k\Omega }.$ Show that the reading on this voltmeter would be $9.5 \mathrm{V}.$