# Circuits

## The Ammeter and the Voltmeter

The Ammeter and the Voltmeter An instrument used to measure currents is called an ammeter. To measure the current in a wire, you usually have to break or cut the wire and insert the ammeter so that the current to be measured passes through the meter.12, ammeter A is set up to measure current i.) It is essential …

## Resistances in Parallel

Resistances in Parallel Figure 28.-8a shows three resistances connected in parallel to an ideal battery of emf . The term “in parallel” means that the resistances are directly wired together on one side and directly wired together on the other side, and that a  potential difference V is applied across the pair of connected sides. Thus, all three …

## Multiloop Circuits

Multiloop Circuits assume the batteries are ideal. There are two junctions in this circuit, at b and d, and there are three branches connecting these junctions. The branches are the left branch (bad), the right branch (bad), and the central branch (bd). What are the currents in the three branches? We arbitrarily label the currents, using a different …

## “Pumping” Charges

“Pumping” Charges If you want to make charge carriers flow through a resistor, you must establish a potential difference between the ends of the device. One way to do this is to connect each end of the resistor to one plate of a charged capacitor. The trouble with this scheme is that the flow of charge acts to …

## Circuits

The electrical field electrons lurks in rivers of South America, killing the fish on which it preys with pulses  current. It does so by producing a potential difference of several hundred vol,ts along its length  the result current he surrounding er, from near the eel’s head e tail region, can be ash as one ampere. If …