NZART Amateur Examination &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp page 3&nbsp &nbsp &nbsp &nbsp &nbsp NZARTX07 Security code 268509
<ol start = 15>
<br>

<li>  One way to operate a 3 volt bulb from a 9 volt supply is 
to connect it in: 

<ol type = a>

<li> series with the supply 

<li> parallel with the supply 

<li> series with a resistor 

<li> parallel with a resistor 


</ol>
<br>

<li>  The total resistance of four 68 ohm resistors wired in 
parallel is: 

<ol type = a>

<li> 12 ohm 

<li> 17 ohm 

<li> 34 ohm 

<li> 272 ohm 


</ol>
<br>

<li>  Three 500 ohm resistors are wired in series. 
Short-circuiting the centre 
resistor will change the value of the network from: 

<ol type = a>

<li> 1500 ohm to 1000 ohm 

<li> 500 ohm to 1000 ohm 

<li> 1000 ohm to 500 ohm 

<li> 1000 ohm to 1500 ohm 


</ol>
<br>

<li>  A 20 ohm resistor carries a current of 0.25 ampere. The 
power dissipated is: 

<ol type = a>

<li> 1.25 watt 

<li> 5 watt 

<li> 2.50 watt 

<li> 10 watt 


</ol>
<br>

<li>  The power dissipation of a resistor carrying a current of 
10 mA with 10 volt 
across it is: 

<ol type = a>

<li> 0.01 watt 

<li> 0.1 watt 

<li> 1 watt 

<li> 10 watt 


</ol>
<br>

<li>  The current in an AC circuit completes a cycle in 0.1 
second. So the 
frequency is: 

<ol type = a>

<li> 1 Hz 

<li> 10 Hz 

<li> 100 Hz 

<li> 1000 Hz 


</ol>
<br>

<li>  Filter capacitors in power supplies are sometimes 
connected in series to: 

<ol type = a>

<li> withstand a greater voltage than a single capacitor can 
withstand 

<li> increase the total capacity 

<li> reduce the ripple voltage further 

<li> resonate the filter circuit 


</ol>
</ol>
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