Figure below is an illustration of a sample electric circuit. Study the figure carefully and answer the questions that follow. (a)(i) Identify the components labeled Y, RH, P, Q. (ii) State the function of Y and Z. (b) Describe the circuit. (c) Give the direction of current. (d) State one function of RH, Q, X, Z.

Step 1: (a) Identify the components labelled $X_1$, $Y$, $R_1$ and $Z$.

$X_1$ is a fuse.

$Y$ is a battery.

$R_1$ is a fixed resistor.

$Z$ is a rheostat.

Final answers for (a):
$X_1$: fuse
$Y$: battery
$R_1$: fixed resistor
$Z$: rheostat

X_1: fuse
Y: battery
R_1: fixed resistor
Z: rheostat

Step 2: (b) Identify the component labelled $v$.

$v$ is a voltmeter.

Final answer for (b): voltmeter

voltmeter

Step 3: (c) State the unit for $R_1$.

The unit for $R_1$ (resistance) is $\Omega$.

Final answer for (c): $\Omega$

\Omega

Step 4: (d) State one use of the component labelled $Z$.

One use of $Z$ (rheostat) is to control/vary the current in the circuit.

Final answer for (d): To control the current in the circuit.

Step 5: (e) State one use of the component labelled $X_1$.

One use of $X_1$ (fuse) is to protect the circuit from damage due to excessive current.

Final answer for (e): To protect the circuit from excessive current.