The circuit’s connecting wires are copper with insulating plastic around them. Name the particles that travel in the copper and state the direction of their movement at point Y in the circuit.
At room temperature, component Z has a resistance of $6.0\,\Omega$. Name component Z.
Calculate the resistance of the complete circuit.
Calculate the current shown by the ammeter.
Here, the current in the ammeter is $I_A$, the current in the $1.5\,\Omega$ resistor is $I_R$ and the current in component Z is $I_Z$. Write an equation linking $I_A$, $I_R$ and $I_Z$.
Before the switch is closed, the trace is a horizontal line through the middle of the screen, as shown in Fig. 10.2. Once the switch is closed, the trace stays horizontal but shifts up the screen. Component Z is heated. State and explain what is observed on the oscilloscope screen as the temperature of Z rises.
The 12 V battery is built from cells with electromotive force (e.m.f.) $1.5\,\text{V}$, all connected in series. Calculate how many $1.5\,\text{V}$ cells are needed to make the battery.
State the e.m.f. of a battery formed by connecting all of these cells in parallel.