Electric circuit

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Across
  1. 1. It lights up when electricity flows through it.
  2. 3. When 2 batteries are connected in series, the bulb is ________.
  3. 4. When the bulb fuses, it creates a _____ circuit.
Down
  1. 2. It is a source of electrical energy.
  2. 5. It opens and closes the circuit.